Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

19 files changed, 842 insertions, 36 deletions

diff --git a/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl b/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl
index e5cd1142b..5f28839f1 100644
--- a/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/ast_passes.ftl
@@ -88,4 +88,5 @@ ast_passes_ty_alias_without_body =
 ast_passes_fn_without_body =
     free function without a body
     .suggestion = provide a definition for the function
-    .extern_block_suggestion = if you meant to declare an externally defined function, use an `extern` block
+
+ast_passes_extern_block_suggestion = if you meant to declare an externally defined function, use an `extern` block
diff --git a/compiler/rustc_error_messages/locales/en-US/borrowck.ftl b/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
index 2cd473322..9e4332c42 100644
--- a/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
@@ -120,3 +120,7 @@ borrowck_cannot_move_when_borrowed =
         [value] value
         *[other] {$value_place}
     } occurs here
+
+borrowck_opaque_type_non_generic_param =
+    expected generic {$kind} parameter, found `{$ty}`
+    .label = this generic parameter must be used with a generic {$kind} parameter
diff --git a/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl b/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl
index 97198cb4b..860212b05 100644
--- a/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl
@@ -17,9 +17,6 @@ codegen_llvm_instrument_coverage_requires_llvm_12 =
 codegen_llvm_symbol_already_defined =
     symbol `{$symbol_name}` is already defined
 
-codegen_llvm_branch_protection_requires_aarch64 =
-    -Zbranch-protection is only supported on aarch64
-
 codegen_llvm_invalid_minimum_alignment =
     invalid minimum global alignment: {$err}
 
diff --git a/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl b/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl
index 4d1f9c1c9..c8c7afb5f 100644
--- a/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/codegen_ssa.ftl
@@ -157,8 +157,6 @@ codegen_ssa_linker_file_stem = couldn't extract file stem from specified linker
 
 codegen_ssa_static_library_native_artifacts = Link against the following native artifacts when linking against this static library. The order and any duplication can be significant on some platforms.
 
-codegen_ssa_native_static_libs = native-static-libs: {$arguments}
-
 codegen_ssa_link_script_unavailable = can only use link script when linking with GNU-like linker
 
 codegen_ssa_link_script_write_failure = failed to write link script to {$path}: {$error}
@@ -192,3 +190,104 @@ codegen_ssa_archive_build_failure =
 
 codegen_ssa_unknown_archive_kind =
     Don't know how to build archive of type: {$kind}
+
+codegen_ssa_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
+
+codegen_ssa_multiple_main_functions = entry symbol `main` declared multiple times
+    .help = did you use `#[no_mangle]` on `fn main`? Use `#[start]` instead
+
+codegen_ssa_metadata_object_file_write = error writing metadata object file: {$error}
+
+codegen_ssa_invalid_windows_subsystem = invalid windows subsystem `{$subsystem}`, only `windows` and `console` are allowed
+
+codegen_ssa_erroneous_constant = erroneous constant encountered
+
+codegen_ssa_shuffle_indices_evaluation = could not evaluate shuffle_indices at compile time
+
+codegen_ssa_missing_memory_ordering = Atomic intrinsic missing memory ordering
+
+codegen_ssa_unknown_atomic_ordering = unknown ordering in atomic intrinsic
+
+codegen_ssa_atomic_compare_exchange = Atomic compare-exchange intrinsic missing failure memory ordering
+
+codegen_ssa_unknown_atomic_operation = unknown atomic operation
+
+codegen_ssa_invalid_monomorphization_basic_integer_type = invalid monomorphization of `{$name}` intrinsic: expected basic integer type, found `{$ty}`
+
+codegen_ssa_invalid_monomorphization_basic_float_type = invalid monomorphization of `{$name}` intrinsic: expected basic float type, found `{$ty}`
+
+codegen_ssa_invalid_monomorphization_float_to_int_unchecked = invalid monomorphization of `float_to_int_unchecked` intrinsic: expected basic float type, found `{$ty}`
+
+codegen_ssa_invalid_monomorphization_floating_point_vector = invalid monomorphization of `{$name}` intrinsic: unsupported element type `{$f_ty}` of floating-point vector `{$in_ty}`
+
+codegen_ssa_invalid_monomorphization_floating_point_type = invalid monomorphization of `{$name}` intrinsic: `{$in_ty}` is not a floating-point type
+
+codegen_ssa_invalid_monomorphization_unrecognized_intrinsic = invalid monomorphization of `{$name}` intrinsic: unrecognized intrinsic `{$name}`
+
+codegen_ssa_invalid_monomorphization_simd_argument = invalid monomorphization of `{$name}` intrinsic: expected SIMD argument type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_input = invalid monomorphization of `{$name}` intrinsic: expected SIMD input type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_first = invalid monomorphization of `{$name}` intrinsic: expected SIMD first type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_second = invalid monomorphization of `{$name}` intrinsic: expected SIMD second type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_third = invalid monomorphization of `{$name}` intrinsic: expected SIMD third type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_simd_return = invalid monomorphization of `{$name}` intrinsic: expected SIMD return type, found non-SIMD `{$ty}`
+
+codegen_ssa_invalid_monomorphization_invalid_bitmask = invalid monomorphization of `{$name}` intrinsic: invalid bitmask `{$mask_ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
+
+codegen_ssa_polymorphic_constant_too_generic = codegen encountered polymorphic constant: TooGeneric
+
+codegen_ssa_invalid_monomorphization_return_length_input_type = invalid monomorphization of `{$name}` intrinsic: expected return type with length {$in_len} (same as input type `{$in_ty}`), found `{$ret_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_second_argument_length = invalid monomorphization of `{$name}` intrinsic: expected second argument with length {$in_len} (same as input type `{$in_ty}`), found `{$arg_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_third_argument_length = invalid monomorphization of `{$name}` intrinsic: expected third argument with length {$in_len} (same as input type `{$in_ty}`), found `{$arg_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_return_integer_type = invalid monomorphization of `{$name}` intrinsic: expected return type with integer elements, found `{$ret_ty}` with non-integer `{$out_ty}`
+
+codegen_ssa_invalid_monomorphization_simd_shuffle = invalid monomorphization of `{$name}` intrinsic: simd_shuffle index must be an array of `u32`, got `{$ty}`
+
+codegen_ssa_invalid_monomorphization_return_length = invalid monomorphization of `{$name}` intrinsic: expected return type of length {$in_len}, found `{$ret_ty}` with length {$out_len}
+
+codegen_ssa_invalid_monomorphization_return_element = invalid monomorphization of `{$name}` intrinsic: expected return element type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}` with element type `{$out_ty}`
+
+codegen_ssa_invalid_monomorphization_shuffle_index_not_constant = invalid monomorphization of `{$name}` intrinsic: shuffle index #{$arg_idx} is not a constant
+
+codegen_ssa_invalid_monomorphization_shuffle_index_out_of_bounds = invalid monomorphization of `{$name}` intrinsic: shuffle index #{$arg_idx} is out of bounds (limit {$total_len})
+
+codegen_ssa_invalid_monomorphization_inserted_type = invalid monomorphization of `{$name}` intrinsic: expected inserted type `{$in_elem}` (element of input `{$in_ty}`), found `{$out_ty}`
+
+codegen_ssa_invalid_monomorphization_return_type = invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_elem}` (element of input `{$in_ty}`), found `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_expected_return_type = invalid monomorphization of `{$name}` intrinsic: expected return type `{$in_ty}`, found `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_mismatched_lengths = invalid monomorphization of `{$name}` intrinsic: mismatched lengths: mask length `{$m_len}` != other vector length `{$v_len}`
+
+codegen_ssa_invalid_monomorphization_mask_type = invalid monomorphization of `{$name}` intrinsic: mask element type is `{$ty}`, expected `i_`
+
+codegen_ssa_invalid_monomorphization_vector_argument = invalid monomorphization of `{$name}` intrinsic: vector argument `{$in_ty}`'s element type `{$in_elem}`, expected integer element type
+
+codegen_ssa_invalid_monomorphization_cannot_return = invalid monomorphization of `{$name}` intrinsic: cannot return `{$ret_ty}`, expected `u{$expected_int_bits}` or `[u8; {$expected_bytes}]`
+
+codegen_ssa_invalid_monomorphization_expected_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of second argument `{$second_arg}` to be a pointer to the element type `{$in_elem}` of the first argument `{$in_ty}`, found `{$expected_element}` != `{$mutability} {$in_elem}`
+
+codegen_ssa_invalid_monomorphization_third_arg_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of third argument `{$third_arg}` to be a signed integer type
+
+codegen_ssa_invalid_monomorphization_unsupported_symbol_of_size = invalid monomorphization of `{$name}` intrinsic: unsupported {$symbol} from `{$in_ty}` with element `{$in_elem}` of size `{$size}` to `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_unsupported_symbol = invalid monomorphization of `{$name}` intrinsic: unsupported {$symbol} from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}`
+
+codegen_ssa_invalid_monomorphization_cast_fat_pointer = invalid monomorphization of `{$name}` intrinsic: cannot cast fat pointer `{$ty}`
+
+codegen_ssa_invalid_monomorphization_expected_pointer = invalid monomorphization of `{$name}` intrinsic: expected pointer, got `{$ty}`
+
+codegen_ssa_invalid_monomorphization_expected_usize = invalid monomorphization of `{$name}` intrinsic: expected `usize`, got `{$ty}`
+
+codegen_ssa_invalid_monomorphization_unsupported_cast = invalid monomorphization of `{$name}` intrinsic: unsupported cast from `{$in_ty}` with element `{$in_elem}` to `{$ret_ty}` with element `{$out_elem}`
+
+codegen_ssa_invalid_monomorphization_unsupported_operation = invalid monomorphization of `{$name}` intrinsic: unsupported operation on `{$in_ty}` with element `{$in_elem}`
+
+codegen_ssa_invalid_monomorphization_expected_vector_element_type = invalid monomorphization of `{$name}` intrinsic: expected element type `{$expected_element}` of vector type `{$vector_type}` to be a signed or unsigned integer type
diff --git a/compiler/rustc_error_messages/locales/en-US/expand.ftl b/compiler/rustc_error_messages/locales/en-US/expand.ftl
index 572059115..df0e8ae5d 100644
--- a/compiler/rustc_error_messages/locales/en-US/expand.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/expand.ftl
@@ -20,3 +20,110 @@ expand_var_still_repeating =
     variable '{$ident}' is still repeating at this depth
 
 expand_meta_var_dif_seq_matchers = {$msg}
+
+expand_macro_const_stability =
+    macros cannot have const stability attributes
+    .label = invalid const stability attribute
+    .label2 = const stability attribute affects this macro
+
+expand_macro_body_stability =
+    macros cannot have body stability attributes
+    .label = invalid body stability attribute
+    .label2 = body stability attribute affects this macro
+
+expand_resolve_relative_path =
+    cannot resolve relative path in non-file source `{$path}`
+
+expand_attr_no_arguments =
+    attribute must have either one or two arguments
+
+expand_not_a_meta_item =
+    not a meta item
+
+expand_only_one_word =
+    must only be one word
+
+expand_cannot_be_name_of_macro =
+    `{$trait_ident}` cannot be a name of {$macro_type} macro
+
+expand_arg_not_attributes =
+    second argument must be `attributes`
+
+expand_attributes_wrong_form =
+    attribute must be of form: `attributes(foo, bar)`
+
+expand_attribute_meta_item =
+    attribute must be a meta item, not a literal
+
+expand_attribute_single_word =
+    attribute must only be a single word
+
+expand_helper_attribute_name_invalid =
+    `{$name}` cannot be a name of derive helper attribute
+
+expand_expected_comma_in_list =
+    expected token: `,`
+
+expand_only_one_argument =
+    {$name} takes 1 argument
+
+expand_takes_no_arguments =
+    {$name} takes no arguments
+
+expand_feature_included_in_edition =
+    the feature `{$feature}` is included in the Rust {$edition} edition
+
+expand_feature_removed =
+    feature has been removed
+    .label = feature has been removed
+    .reason = {$reason}
+
+expand_feature_not_allowed =
+    the feature `{$name}` is not in the list of allowed features
+
+expand_recursion_limit_reached =
+    recursion limit reached while expanding `{$descr}`
+    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
+
+expand_malformed_feature_attribute =
+    malformed `feature` attribute input
+    .expected = expected just one word
+
+expand_remove_expr_not_supported =
+    removing an expression is not supported in this position
+
+expand_invalid_cfg_no_parens = `cfg` is not followed by parentheses
+expand_invalid_cfg_no_predicate = `cfg` predicate is not specified
+expand_invalid_cfg_multiple_predicates = multiple `cfg` predicates are specified
+expand_invalid_cfg_predicate_literal = `cfg` predicate key cannot be a literal
+expand_invalid_cfg_expected_syntax = expected syntax is
+
+expand_wrong_fragment_kind =
+    non-{$kind} macro in {$kind} position: {$name}
+
+expand_unsupported_key_value =
+    key-value macro attributes are not supported
+
+expand_incomplete_parse =
+    macro expansion ignores token `{$token}` and any following
+    .label = caused by the macro expansion here
+    .note = the usage of `{$macro_path}!` is likely invalid in {$kind_name} context
+    .suggestion_add_semi = you might be missing a semicolon here
+
+expand_remove_node_not_supported =
+    removing {$descr} is not supported in this position
+
+expand_module_circular =
+    circular modules: {$modules}
+
+expand_module_in_block =
+    cannot declare a non-inline module inside a block unless it has a path attribute
+    .note = maybe `use` the module `{$name}` instead of redeclaring it
+
+expand_module_file_not_found =
+    file not found for module `{$name}`
+    .help = to create the module `{$name}`, create file "{$default_path}" or "{$secondary_path}"
+
+expand_module_multiple_candidates =
+    file for module `{$name}` found at both "{$default_path}" and "{$secondary_path}"
+    .help = delete or rename one of them to remove the ambiguity
diff --git a/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl b/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
index a9ea161b9..41f458f6c 100644
--- a/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
@@ -20,6 +20,10 @@ hir_analysis_lifetimes_or_bounds_mismatch_on_trait =
     .where_label = this `where` clause might not match the one in the trait
     .bounds_label = this bound might be missing in the impl
 
+hir_analysis_async_trait_impl_should_be_async =
+    method `{$method_name}` should be async because the method from the trait is async
+    .trait_item_label = required because the trait method is async
+
 hir_analysis_drop_impl_on_wrong_item =
     the `Drop` trait may only be implemented for local structs, enums, and unions
     .label = must be a struct, enum, or union in the current crate
@@ -101,8 +105,6 @@ hir_analysis_extern_crate_not_idiomatic =
     `extern crate` is not idiomatic in the new edition
     .suggestion = convert it to a `{$msg_code}`
 
-hir_analysis_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
-
 hir_analysis_const_impl_for_non_const_trait =
     const `impl` for trait `{$trait_name}` which is not marked with `#[const_trait]`
     .suggestion = mark `{$trait_name}` as const
@@ -118,3 +120,7 @@ hir_analysis_self_in_impl_self =
 
 hir_analysis_linkage_type =
     invalid type for variable with `#[linkage]` attribute
+
+hir_analysis_auto_deref_reached_recursion_limit = reached the recursion limit while auto-dereferencing `{$ty}`
+    .label = deref recursion limit reached
+    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
diff --git a/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl b/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl
index 0612dbae0..ca72b7faa 100644
--- a/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/hir_typeck.ftl
@@ -46,3 +46,14 @@ hir_typeck_add_missing_parentheses_in_range = you must surround the range in par
 
 hir_typeck_op_trait_generic_params =
     `{$method_name}` must not have any generic parameters
+
+hir_typeck_lang_start_incorrect_number_params = incorrect number of parameters for the `start` lang item
+hir_typeck_lang_start_incorrect_number_params_note_expected_count = the `start` lang item should have four parameters, but found {$found_param_count}
+
+hir_typeck_lang_start_expected_sig_note = the `start` lang item should have the signature `fn(fn() -> T, isize, *const *const u8, u8) -> isize`
+
+hir_typeck_lang_start_incorrect_param = parameter {$param_num} of the `start` lang item is incorrect
+    .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
+
+hir_typeck_lang_start_incorrect_ret_ty = the return type of the `start` lang item is incorrect
+    .suggestion = change the type from `{$found_ty}` to `{$expected_ty}`
diff --git a/compiler/rustc_error_messages/locales/en-US/infer.ftl b/compiler/rustc_error_messages/locales/en-US/infer.ftl
index c9d83746d..cc38d71b4 100644
--- a/compiler/rustc_error_messages/locales/en-US/infer.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/infer.ftl
@@ -101,7 +101,6 @@ infer_subtype_2 = ...so that {$requirement ->
 infer_reborrow = ...so that reference does not outlive borrowed content
 infer_reborrow_upvar = ...so that closure can access `{$name}`
 infer_relate_object_bound = ...so that it can be closed over into an object
-infer_data_borrowed = ...so that the type `{$name}` is not borrowed for too long
 infer_reference_outlives_referent = ...so that the reference type `{$name}` does not outlive the data it points at
 infer_relate_param_bound = ...so that the type `{$name}` will meet its required lifetime bounds{$continues ->
     [true] ...
@@ -172,3 +171,142 @@ infer_msl_unmet_req = because this has an unmet lifetime requirement
 infer_msl_trait_note = this has an implicit `'static` lifetime requirement
 infer_msl_trait_sugg = consider relaxing the implicit `'static` requirement
 infer_suggest_add_let_for_letchains = consider adding `let`
+
+infer_explicit_lifetime_required_with_ident = explicit lifetime required in the type of `{$simple_ident}`
+    .label = lifetime `{$named}` required
+
+infer_explicit_lifetime_required_with_param_type = explicit lifetime required in parameter type
+    .label = lifetime `{$named}` required
+
+infer_explicit_lifetime_required_sugg_with_ident = add explicit lifetime `{$named}` to the type of `{$simple_ident}`
+
+infer_explicit_lifetime_required_sugg_with_param_type = add explicit lifetime `{$named}` to type
+
+infer_actual_impl_expl_expected_signature_two = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
+infer_actual_impl_expl_expected_signature_any = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for any lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_signature_some = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`, for some specific lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_signature_nothing = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}closure with signature `{$ty_or_sig}` must implement `{$trait_path}`
+infer_actual_impl_expl_expected_passive_two = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
+infer_actual_impl_expl_expected_passive_any = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for any lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_passive_some = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`, for some specific lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_passive_nothing = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$trait_path}` would have to be implemented for the type `{$ty_or_sig}`
+infer_actual_impl_expl_expected_other_two = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`, for any two lifetimes `'{$lifetime_1}` and `'{$lifetime_2}`...
+infer_actual_impl_expl_expected_other_any = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`, for any lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_other_some = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`, for some specific lifetime `'{$lifetime_1}`...
+infer_actual_impl_expl_expected_other_nothing = {$leading_ellipsis ->
+    [true] ...
+    *[false] {""}
+}`{$ty_or_sig}` must implement `{$trait_path}`
+
+infer_actual_impl_expl_but_actually_implements_trait = ...but it actually implements `{$trait_path}`{$has_lifetime ->
+    [true] , for some specific lifetime `'{$lifetime}`
+    *[false] {""}
+}
+infer_actual_impl_expl_but_actually_implemented_for_ty = ...but `{$trait_path}` is actually implemented for the type `{$ty}`{$has_lifetime ->
+    [true] , for some specific lifetime `'{$lifetime}`
+    *[false] {""}
+}
+infer_actual_impl_expl_but_actually_ty_implements = ...but `{$ty}` actually implements `{$trait_path}`{$has_lifetime ->
+    [true] , for some specific lifetime `'{$lifetime}`
+    *[false] {""}
+}
+
+infer_trait_placeholder_mismatch = implementation of `{$trait_def_id}` is not general enough
+    .label_satisfy = doesn't satisfy where-clause
+    .label_where = due to a where-clause on `{$def_id}`...
+    .label_dup = implementation of `{$trait_def_id}` is not general enough
+
+infer_trait_impl_diff = `impl` item signature doesn't match `trait` item signature
+    .found = found `{$found}`
+    .expected = expected `{$expected}`
+    .expected_found = expected signature `{$expected}`
+               {"   "}found signature `{$found}`
+
+infer_tid_rel_help = verify the lifetime relationships in the `trait` and `impl` between the `self` argument, the other inputs and its output
+infer_tid_consider_borrowing = consider borrowing this type parameter in the trait
+infer_tid_param_help = the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
+
+infer_dtcs_has_lifetime_req_label = this has an implicit `'static` lifetime requirement
+infer_dtcs_introduces_requirement = calling this method introduces the `impl`'s 'static` requirement
+infer_dtcs_has_req_note = the used `impl` has a `'static` requirement
+infer_dtcs_suggestion = consider relaxing the implicit `'static` requirement
+
+infer_but_calling_introduces = {$has_param_name ->
+    [true] `{$param_name}`
+    *[false] `fn` parameter
+} has {$lifetime_kind ->
+    [named] lifetime `{$lifetime}`
+    *[anon] an anonymous lifetime `'_`
+} but calling `{assoc_item}` introduces an implicit `'static` lifetime requirement
+    .label1 = {$has_lifetime ->
+        [named] lifetime `{$lifetime}`
+        *[anon] an anonymous lifetime `'_`
+    }
+    .label2 = ...is used and required to live as long as `'static` here because of an implicit lifetime bound on the {$has_impl_path ->
+        [named] `impl` of `{$impl_path}`
+        *[anon] inherent `impl`
+    }
+
+infer_but_needs_to_satisfy = {$has_param_name ->
+    [true] `{$param_name}`
+    *[false] `fn` parameter
+} has {$has_lifetime ->
+    [named] lifetime `{$lifetime}`
+    *[anon] an anonymous lifetime `'_`
+} but it needs to satisfy a `'static` lifetime requirement
+    .influencer = this data with {$has_lifetime ->
+        [named] lifetime `{$lifetime}`
+        *[anon] an anonymous lifetime `'_`
+    }...
+    .require = {$spans_empty ->
+        *[true] ...is used and required to live as long as `'static` here
+        [false] ...and is required to live as long as `'static` here
+    }
+    .used_here = ...is used here...
+    .introduced_by_bound = 'static` lifetime requirement introduced by this bound
+
+infer_more_targeted = {$has_param_name ->
+    [true] `{$param_name}`
+    *[false] `fn` parameter
+} has {$has_lifetime ->
+    [named] lifetime `{$lifetime}`
+    *[anon] an anonymous lifetime `'_`
+} but calling `{$ident}` introduces an implicit `'static` lifetime requirement
+
+infer_ril_introduced_here = `'static` requirement introduced here
+infer_ril_introduced_by = requirement introduced by this return type
+infer_ril_because_of = because of this returned expression
+infer_ril_static_introduced_by = "`'static` lifetime requirement introduced by the return type
diff --git a/compiler/rustc_error_messages/locales/en-US/interface.ftl b/compiler/rustc_error_messages/locales/en-US/interface.ftl
index bbcb8fc28..688b04472 100644
--- a/compiler/rustc_error_messages/locales/en-US/interface.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/interface.ftl
@@ -41,3 +41,6 @@ interface_rustc_error_unexpected_annotation =
 
 interface_failed_writing_file =
     failed to write file {$path}: {$error}"
+
+interface_proc_macro_crate_panic_abort =
+    building proc macro crate with `panic=abort` may crash the compiler should the proc-macro panic
diff --git a/compiler/rustc_error_messages/locales/en-US/lint.ftl b/compiler/rustc_error_messages/locales/en-US/lint.ftl
index 2eb409a5d..d63ff77d8 100644
--- a/compiler/rustc_error_messages/locales/en-US/lint.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/lint.ftl
@@ -15,6 +15,43 @@ lint_enum_intrinsics_mem_variant =
 
 lint_expectation = this lint expectation is unfulfilled
     .note = the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message
+    .rationale = {$rationale}
+
+lint_for_loops_over_fallibles =
+    for loop over {$article} `{$ty}`. This is more readably written as an `if let` statement
+    .suggestion = consider using `if let` to clear intent
+    .remove_next = to iterate over `{$recv_snip}` remove the call to `next`
+    .use_while_let = to check pattern in a loop use `while let`
+    .use_question_mark = consider unwrapping the `Result` with `?` to iterate over its contents
+
+lint_non_binding_let_on_sync_lock =
+    non-binding let on a synchronization lock
+
+lint_non_binding_let_on_drop_type =
+    non-binding let on a type that implements `Drop`
+
+lint_non_binding_let_suggestion =
+    consider binding to an unused variable to avoid immediately dropping the value
+
+lint_non_binding_let_multi_suggestion =
+    consider immediately dropping the value
+
+lint_deprecated_lint_name =
+    lint name `{$name}` is deprecated and may not have an effect in the future.
+    .suggestion = change it to
+
+lint_renamed_or_removed_lint = {$msg}
+    .suggestion = use the new name
+
+lint_unknown_lint =
+    unknown lint: `{$name}`
+    .suggestion = did you mean
+
+lint_ignored_unless_crate_specified = {$level}({$name}) is ignored unless specified at crate level
+
+lint_unknown_gated_lint =
+    unknown lint: `{$name}`
+    .note = the `{$name}` lint is unstable
 
 lint_hidden_unicode_codepoints = unicode codepoint changing visible direction of text present in {$label}
     .label = this {$label} contains {$count ->
@@ -55,6 +92,8 @@ lint_diag_out_of_impl =
 
 lint_untranslatable_diag = diagnostics should be created using translatable messages
 
+lint_bad_opt_access = {$msg}
+
 lint_cstring_ptr = getting the inner pointer of a temporary `CString`
     .as_ptr_label = this pointer will be invalid
     .unwrap_label = this `CString` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
@@ -331,6 +370,8 @@ lint_builtin_anonymous_params = anonymous parameters are deprecated and will be
     .suggestion = try naming the parameter or explicitly ignoring it
 
 lint_builtin_deprecated_attr_link = use of deprecated attribute `{$name}`: {$reason}. See {$link}
+    .msg_suggestion = {$msg}
+    .default_suggestion = remove this attribute
 lint_builtin_deprecated_attr_used = use of deprecated attribute `{$name}`: no longer used.
 lint_builtin_deprecated_attr_default_suggestion = remove this attribute
 
@@ -391,10 +432,16 @@ lint_builtin_incomplete_features = the feature `{$name}` is incomplete and may n
     .note = see issue #{$n} <https://github.com/rust-lang/rust/issues/{$n}> for more information
     .help = consider using `min_{$name}` instead, which is more stable and complete
 
-lint_builtin_clashing_extern_same_name = `{$this_fi}` redeclared with a different signature
+lint_builtin_unpermitted_type_init_zeroed = the type `{$ty}` does not permit zero-initialization
+lint_builtin_unpermitted_type_init_unint = the type `{$ty}` does not permit being left uninitialized
+
+lint_builtin_unpermitted_type_init_label = this code causes undefined behavior when executed
+lint_builtin_unpermitted_type_init_label_suggestion = help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+
+lint_builtin_clashing_extern_same_name = `{$this}` redeclared with a different signature
     .previous_decl_label = `{$orig}` previously declared here
     .mismatch_label = this signature doesn't match the previous declaration
-lint_builtin_clashing_extern_diff_name = `{$this_fi}` redeclares `{$orig}` with a different signature
+lint_builtin_clashing_extern_diff_name = `{$this}` redeclares `{$orig}` with a different signature
     .previous_decl_label = `{$orig}` previously declared here
     .mismatch_label = this signature doesn't match the previous declaration
 
@@ -403,6 +450,16 @@ lint_builtin_deref_nullptr = dereferencing a null pointer
 
 lint_builtin_asm_labels = avoid using named labels in inline assembly
 
+lint_builtin_special_module_name_used_lib = found module declaration for lib.rs
+    .note = lib.rs is the root of this crate's library target
+    .help = to refer to it from other targets, use the library's name as the path
+
+lint_builtin_special_module_name_used_main = found module declaration for main.rs
+    .note = a binary crate cannot be used as library
+
+lint_supertrait_as_deref_target = `{$t}` implements `Deref` with supertrait `{$target_principal}` as target
+    .label = target type is set here
+
 lint_overruled_attribute = {$lint_level}({$lint_source}) incompatible with previous forbid
     .label = overruled by previous forbid
 
diff --git a/compiler/rustc_error_messages/locales/en-US/metadata.ftl b/compiler/rustc_error_messages/locales/en-US/metadata.ftl
index d1e1fd54d..79b8b4172 100644
--- a/compiler/rustc_error_messages/locales/en-US/metadata.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/metadata.ftl
@@ -4,6 +4,11 @@ metadata_rlib_required =
 metadata_lib_required =
     crate `{$crate_name}` required to be available in {$kind} format, but was not found in this form
 
+metadata_rustc_lib_required =
+    crate `{$crate_name}` required to be available in {$kind} format, but was not found in this form
+    .note = only .rmeta files are distributed for `rustc_private` crates other than `rustc_driver`
+    .help = try adding `extern crate rustc_driver;` at the top level of this crate
+
 metadata_crate_dep_multiple =
     cannot satisfy dependencies so `{$crate_name}` only shows up once
     .help = having upstream crates all available in one format will likely make this go away
@@ -166,12 +171,6 @@ metadata_conflicting_alloc_error_handler =
 metadata_global_alloc_required =
     no global memory allocator found but one is required; link to std or add `#[global_allocator]` to a static item that implements the GlobalAlloc trait
 
-metadata_alloc_func_required =
-    `#[alloc_error_handler]` function required, but not found
-
-metadata_missing_alloc_error_handler =
-    use `#![feature(default_alloc_error_handler)]` for a default error handler
-
 metadata_no_transitive_needs_dep =
     the crate `{$crate_name}` cannot depend on a crate that needs {$needs_crate_name}, but it depends on `{$deps_crate_name}`
 
@@ -202,11 +201,7 @@ metadata_extern_location_not_file =
     extern location for {$crate_name} is not a file: {$location}
 
 metadata_multiple_candidates =
-    multiple {$flavor} candidates for `{$crate_name}` found
-
-metadata_multiple_matching_crates =
-    multiple matching crates for `{$crate_name}`
-    .note = candidates:{$candidates}
+    multiple candidates for `{$flavor}` dependency `{$crate_name}` found
 
 metadata_symbol_conflicts_current =
     the current crate is indistinguishable from one of its dependencies: it has the same crate-name `{$crate_name}` and was compiled with the same `-C metadata` arguments. This will result in symbol conflicts between the two.
diff --git a/compiler/rustc_error_messages/locales/en-US/mir_build.ftl b/compiler/rustc_error_messages/locales/en-US/mir_build.ftl
new file mode 100644
index 000000000..224855fff
--- /dev/null
+++ b/compiler/rustc_error_messages/locales/en-US/mir_build.ftl
@@ -0,0 +1,368 @@
+mir_build_unconditional_recursion = function cannot return without recursing
+    .label = cannot return without recursing
+    .help = a `loop` may express intention better if this is on purpose
+
+mir_build_unconditional_recursion_call_site_label = recursive call site
+
+mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe =
+    call to unsafe function `{$function}` is unsafe and requires unsafe block (error E0133)
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_unsafe_op_in_unsafe_fn_call_to_unsafe_fn_requires_unsafe_nameless =
+    call to unsafe function is unsafe and requires unsafe block (error E0133)
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_unsafe_op_in_unsafe_fn_inline_assembly_requires_unsafe =
+    use of inline assembly is unsafe and requires unsafe block (error E0133)
+    .note = inline assembly is entirely unchecked and can cause undefined behavior
+    .label = use of inline assembly
+
+mir_build_unsafe_op_in_unsafe_fn_initializing_type_with_requires_unsafe =
+    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe
+    block (error E0133)
+    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
+    .label = initializing type with `rustc_layout_scalar_valid_range` attr
+
+mir_build_unsafe_op_in_unsafe_fn_mutable_static_requires_unsafe =
+    use of mutable static is unsafe and requires unsafe block (error E0133)
+    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
+    .label = use of mutable static
+
+mir_build_unsafe_op_in_unsafe_fn_extern_static_requires_unsafe =
+    use of extern static is unsafe and requires unsafe block (error E0133)
+    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+    .label = use of extern static
+
+mir_build_unsafe_op_in_unsafe_fn_deref_raw_pointer_requires_unsafe =
+    dereference of raw pointer is unsafe and requires unsafe block (error E0133)
+    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
+    .label = dereference of raw pointer
+
+mir_build_unsafe_op_in_unsafe_fn_union_field_requires_unsafe =
+    access to union field is unsafe and requires unsafe block (error E0133)
+    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
+    .label = access to union field
+
+mir_build_unsafe_op_in_unsafe_fn_mutation_of_layout_constrained_field_requires_unsafe =
+    mutation of layout constrained field is unsafe and requires unsafe block (error E0133)
+    .note = mutating layout constrained fields cannot statically be checked for valid values
+    .label = mutation of layout constrained field
+
+mir_build_unsafe_op_in_unsafe_fn_borrow_of_layout_constrained_field_requires_unsafe =
+    borrow of layout constrained field with interior mutability is unsafe and requires unsafe block (error E0133)
+    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
+    .label = borrow of layout constrained field with interior mutability
+
+mir_build_unsafe_op_in_unsafe_fn_call_to_fn_with_requires_unsafe =
+    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block (error E0133)
+    .note = can only be called if the required target features are available
+    .label = call to function with `#[target_feature]`
+
+mir_build_call_to_unsafe_fn_requires_unsafe =
+    call to unsafe function `{$function}` is unsafe and requires unsafe block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_call_to_unsafe_fn_requires_unsafe_nameless =
+    call to unsafe function is unsafe and requires unsafe block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_call_to_unsafe_fn_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    call to unsafe function `{$function}` is unsafe and requires unsafe function or block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_call_to_unsafe_fn_requires_unsafe_nameless_unsafe_op_in_unsafe_fn_allowed =
+    call to unsafe function is unsafe and requires unsafe function or block
+    .note = consult the function's documentation for information on how to avoid undefined behavior
+    .label = call to unsafe function
+
+mir_build_inline_assembly_requires_unsafe =
+    use of inline assembly is unsafe and requires unsafe block
+    .note = inline assembly is entirely unchecked and can cause undefined behavior
+    .label = use of inline assembly
+
+mir_build_inline_assembly_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    use of inline assembly is unsafe and requires unsafe function or block
+    .note = inline assembly is entirely unchecked and can cause undefined behavior
+    .label = use of inline assembly
+
+mir_build_initializing_type_with_requires_unsafe =
+    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe block
+    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
+    .label = initializing type with `rustc_layout_scalar_valid_range` attr
+
+mir_build_initializing_type_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe function or block
+    .note = initializing a layout restricted type's field with a value outside the valid range is undefined behavior
+    .label = initializing type with `rustc_layout_scalar_valid_range` attr
+
+mir_build_mutable_static_requires_unsafe =
+    use of mutable static is unsafe and requires unsafe block
+    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
+    .label = use of mutable static
+
+mir_build_mutable_static_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    use of mutable static is unsafe and requires unsafe function or block
+    .note = mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
+    .label = use of mutable static
+
+mir_build_extern_static_requires_unsafe =
+    use of extern static is unsafe and requires unsafe block
+    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+    .label = use of extern static
+
+mir_build_extern_static_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    use of extern static is unsafe and requires unsafe function or block
+    .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+    .label = use of extern static
+
+mir_build_deref_raw_pointer_requires_unsafe =
+    dereference of raw pointer is unsafe and requires unsafe block
+    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
+    .label = dereference of raw pointer
+
+mir_build_deref_raw_pointer_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    dereference of raw pointer is unsafe and requires unsafe function or block
+    .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
+    .label = dereference of raw pointer
+
+mir_build_union_field_requires_unsafe =
+    access to union field is unsafe and requires unsafe block
+    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
+    .label = access to union field
+
+mir_build_union_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    access to union field is unsafe and requires unsafe function or block
+    .note = the field may not be properly initialized: using uninitialized data will cause undefined behavior
+    .label = access to union field
+
+mir_build_mutation_of_layout_constrained_field_requires_unsafe =
+    mutation of layout constrained field is unsafe and requires unsafe block
+    .note = mutating layout constrained fields cannot statically be checked for valid values
+    .label = mutation of layout constrained field
+
+mir_build_mutation_of_layout_constrained_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    mutation of layout constrained field is unsafe and requires unsafe function or block
+    .note = mutating layout constrained fields cannot statically be checked for valid values
+    .label = mutation of layout constrained field
+
+mir_build_borrow_of_layout_constrained_field_requires_unsafe =
+    borrow of layout constrained field with interior mutability is unsafe and requires unsafe block
+    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
+    .label = borrow of layout constrained field with interior mutability
+
+mir_build_borrow_of_layout_constrained_field_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    borrow of layout constrained field with interior mutability is unsafe and requires unsafe function or block
+    .note = references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values
+    .label = borrow of layout constrained field with interior mutability
+
+mir_build_call_to_fn_with_requires_unsafe =
+    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe block
+    .note = can only be called if the required target features are available
+    .label = call to function with `#[target_feature]`
+
+mir_build_call_to_fn_with_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
+    call to function `{$function}` with `#[target_feature]` is unsafe and requires unsafe function or block
+    .note = can only be called if the required target features are available
+    .label = call to function with `#[target_feature]`
+
+mir_build_unused_unsafe = unnecessary `unsafe` block
+    .label = unnecessary `unsafe` block
+
+mir_build_unused_unsafe_enclosing_block_label = because it's nested under this `unsafe` block
+mir_build_unused_unsafe_enclosing_fn_label = because it's nested under this `unsafe` fn
+
+mir_build_non_exhaustive_patterns_type_not_empty = non-exhaustive patterns: type `{$ty}` is non-empty
+    .def_note = `{$peeled_ty}` defined here
+    .type_note = the matched value is of type `{$ty}`
+    .non_exhaustive_type_note = the matched value is of type `{$ty}`, which is marked as non-exhaustive
+    .reference_note = references are always considered inhabited
+    .suggestion = ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown
+    .help = ensure that all possible cases are being handled by adding a match arm with a wildcard pattern
+
+mir_build_static_in_pattern = statics cannot be referenced in patterns
+
+mir_build_assoc_const_in_pattern = associated consts cannot be referenced in patterns
+
+mir_build_const_param_in_pattern = const parameters cannot be referenced in patterns
+
+mir_build_non_const_path = runtime values cannot be referenced in patterns
+
+mir_build_unreachable_pattern = unreachable pattern
+    .label = unreachable pattern
+    .catchall_label = matches any value
+
+mir_build_const_pattern_depends_on_generic_parameter =
+    constant pattern depends on a generic parameter
+
+mir_build_could_not_eval_const_pattern = could not evaluate constant pattern
+
+mir_build_lower_range_bound_must_be_less_than_or_equal_to_upper =
+    lower range bound must be less than or equal to upper
+    .label = lower bound larger than upper bound
+    .teach_note = When matching against a range, the compiler verifies that the range is non-empty. Range patterns include both end-points, so this is equivalent to requiring the start of the range to be less than or equal to the end of the range.
+
+mir_build_literal_in_range_out_of_bounds =
+    literal out of range for `{$ty}`
+    .label = this value doesn't fit in `{$ty}` whose maximum value is `{$max}`
+
+mir_build_lower_range_bound_must_be_less_than_upper = lower range bound must be less than upper
+
+mir_build_leading_irrefutable_let_patterns = leading irrefutable {$count ->
+        [one] pattern
+        *[other] patterns
+    } in let chain
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match
+    .help = consider moving {$count ->
+        [one] it
+        *[other] them
+    } outside of the construct
+
+mir_build_trailing_irrefutable_let_patterns = trailing irrefutable {$count ->
+        [one] pattern
+        *[other] patterns
+    } in let chain
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match
+    .help = consider moving {$count ->
+        [one] it
+        *[other] them
+    } into the body
+
+mir_build_bindings_with_variant_name =
+    pattern binding `{$ident}` is named the same as one of the variants of the type `{$ty_path}`
+    .suggestion = to match on the variant, qualify the path
+
+mir_build_irrefutable_let_patterns_generic_let = irrefutable `let` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the `let` is useless
+    .help = consider removing `let`
+
+mir_build_irrefutable_let_patterns_if_let = irrefutable `if let` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the `if let` is useless
+    .help = consider replacing the `if let` with a `let`
+
+mir_build_irrefutable_let_patterns_if_let_guard = irrefutable `if let` guard {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the guard is useless
+    .help = consider removing the guard and adding a `let` inside the match arm
+
+mir_build_irrefutable_let_patterns_let_else = irrefutable `let...else` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the `else` clause is useless
+    .help = consider removing the `else` clause
+
+mir_build_irrefutable_let_patterns_while_let = irrefutable `while let` {$count ->
+        [one] pattern
+        *[other] patterns
+    }
+    .note = {$count ->
+        [one] this pattern
+        *[other] these patterns
+    } will always match, so the loop will never exit
+    .help = consider instead using a `loop {"{"} ... {"}"}` with a `let` inside it
+
+mir_build_borrow_of_moved_value = borrow of moved value
+    .label = value moved into `{$name}` here
+    .occurs_because_label = move occurs because `{$name}` has type `{$ty}` which does not implement the `Copy` trait
+    .value_borrowed_label = value borrowed here after move
+    .suggestion = borrow this binding in the pattern to avoid moving the value
+
+mir_build_multiple_mut_borrows = cannot borrow value as mutable more than once at a time
+    .label = first mutable borrow, by `{$name}`, occurs here
+    .mutable_borrow = another mutable borrow, by `{$name_mut}`, occurs here
+    .immutable_borrow = also borrowed as immutable, by `{$name_immut}`, here
+    .moved = also moved into `{$name_moved}` here
+
+mir_build_union_pattern = cannot use unions in constant patterns
+
+mir_build_type_not_structural =
+     to use a constant of type `{$non_sm_ty}` in a pattern, `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
+
+mir_build_unsized_pattern = cannot use unsized non-slice type `{$non_sm_ty}` in constant patterns
+
+mir_build_invalid_pattern = `{$non_sm_ty}` cannot be used in patterns
+
+mir_build_float_pattern = floating-point types cannot be used in patterns
+
+mir_build_pointer_pattern = function pointers and unsized pointers in patterns behave unpredictably and should not be relied upon. See https://github.com/rust-lang/rust/issues/70861 for details.
+
+mir_build_indirect_structural_match =
+    to use a constant of type `{$non_sm_ty}` in a pattern, `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
+
+mir_build_nontrivial_structural_match =
+    to use a constant of type `{$non_sm_ty}` in a pattern, the constant's initializer must be trivial or `{$non_sm_ty}` must be annotated with `#[derive(PartialEq, Eq)]`
+
+mir_build_overlapping_range_endpoints = multiple patterns overlap on their endpoints
+    .range = ... with this range
+    .note = you likely meant to write mutually exclusive ranges
+
+mir_build_non_exhaustive_omitted_pattern = some variants are not matched explicitly
+    .help = ensure that all variants are matched explicitly by adding the suggested match arms
+    .note = the matched value is of type `{$scrut_ty}` and the `non_exhaustive_omitted_patterns` attribute was found
+
+mir_build_uncovered = {$count ->
+        [1] pattern `{$witness_1}`
+        [2] patterns `{$witness_1}` and `{$witness_2}`
+        [3] patterns `{$witness_1}`, `{$witness_2}` and `{$witness_3}`
+        *[other] patterns `{$witness_1}`, `{$witness_2}`, `{$witness_3}` and {$remainder} more
+    } not covered
+
+mir_build_pattern_not_covered = refutable pattern in {$origin}
+    .pattern_ty = the matched value is of type `{$pattern_ty}`
+
+mir_build_inform_irrefutable = `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+
+mir_build_more_information = for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+
+mir_build_res_defined_here = {$res} defined here
+
+mir_build_adt_defined_here = `{$ty}` defined here
+
+mir_build_variant_defined_here = not covered
+
+mir_build_interpreted_as_const = introduce a variable instead
+
+mir_build_confused = missing patterns are not covered because `{$variable}` is interpreted as {$article} {$res} pattern, not a new variable
+
+mir_build_suggest_if_let = you might want to use `if let` to ignore the {$count ->
+        [one] variant that isn't
+        *[other] variants that aren't
+    } matched
+
+mir_build_suggest_let_else = you might want to use `let else` to handle the {$count ->
+        [one] variant that isn't
+        *[other] variants that aren't
+    } matched
+
+mir_build_suggest_attempted_int_lit = alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
diff --git a/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl b/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl
index 48ddb54b7..243d10bfa 100644
--- a/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/monomorphize.ftl
@@ -21,3 +21,6 @@ monomorphize_large_assignments =
     moving {$size} bytes
     .label = value moved from here
     .note = The current maximum size is {$limit}, but it can be customized with the move_size_limit attribute: `#![move_size_limit = "..."]`
+
+monomorphize_couldnt_dump_mono_stats =
+    unexpected error occurred while dumping monomorphization stats: {$error}
diff --git a/compiler/rustc_error_messages/locales/en-US/parse.ftl b/compiler/rustc_error_messages/locales/en-US/parse.ftl
index 114b7ec16..8f063f508 100644
--- a/compiler/rustc_error_messages/locales/en-US/parse.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/parse.ftl
@@ -2,6 +2,10 @@ parse_struct_literal_body_without_path =
     struct literal body without path
     .suggestion = you might have forgotten to add the struct literal inside the block
 
+parse_struct_literal_needing_parens =
+    invalid struct literal
+    .suggestion = you might need to surround the struct literal in parentheses
+
 parse_maybe_report_ambiguous_plus =
     ambiguous `+` in a type
     .suggestion = use parentheses to disambiguate
@@ -362,3 +366,15 @@ parse_fn_ptr_with_generics = function pointer types may not have generic paramet
 
 parse_invalid_identifier_with_leading_number = expected identifier, found number literal
     .label = identifiers cannot start with a number
+
+parse_maybe_fn_typo_with_impl = you might have meant to write `impl` instead of `fn`
+    .suggestion = replace `fn` with `impl` here
+
+parse_expected_fn_path_found_fn_keyword = expected identifier, found keyword `fn`
+    .suggestion = use `Fn` to refer to the trait
+
+parse_where_clause_before_tuple_struct_body = where clauses are not allowed before tuple struct bodies
+    .label = unexpected where clause
+    .name_label = while parsing this tuple struct
+    .body_label = the struct body
+    .suggestion = move the body before the where clause
diff --git a/compiler/rustc_error_messages/locales/en-US/passes.ftl b/compiler/rustc_error_messages/locales/en-US/passes.ftl
index 001e53d1d..91857dd22 100644
--- a/compiler/rustc_error_messages/locales/en-US/passes.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/passes.ftl
@@ -4,6 +4,9 @@
 -passes_see_issue =
     see issue #{$issue} <https://github.com/rust-lang/rust/issues/{$issue}> for more information
 
+passes_incorrect_do_not_recommend_location =
+    `#[do_not_recommend]` can only be placed on trait implementations
+
 passes_outer_crate_level_attr =
     crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
 
diff --git a/compiler/rustc_error_messages/locales/en-US/session.ftl b/compiler/rustc_error_messages/locales/en-US/session.ftl
index 983eb9262..bc37d91a7 100644
--- a/compiler/rustc_error_messages/locales/en-US/session.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/session.ftl
@@ -41,6 +41,8 @@ session_unsupported_dwarf_version = requested DWARF version {$dwarf_version} is
 
 session_target_stack_protector_not_supported = `-Z stack-protector={$stack_protector}` is not supported for target {$target_triple} and will be ignored
 
+session_branch_protection_requires_aarch64 = `-Zbranch-protection` is only supported on aarch64
+
 session_split_debuginfo_unstable_platform = `-Csplit-debuginfo={$debuginfo}` is unstable on this platform
 
 session_file_is_not_writeable = output file {$file} is not writeable -- check its permissions
@@ -83,6 +85,7 @@ session_invalid_float_literal_suffix = invalid suffix `{$suffix}` for float lite
     .help = valid suffixes are `f32` and `f64`
 
 session_int_literal_too_large = integer literal is too large
+    .note = value exceeds limit of `{$limit}`
 
 session_invalid_int_literal_width = invalid width `{$width}` for integer literal
     .help = valid widths are 8, 16, 32, 64 and 128
diff --git a/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl b/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl
index 004e0ab18..14eb4a550 100644
--- a/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/trait_selection.ftl
@@ -2,10 +2,6 @@ trait_selection_dump_vtable_entries = vtable entries for `{$trait_ref}`: {$entri
 
 trait_selection_unable_to_construct_constant_value = unable to construct a constant value for the unevaluated constant {$unevaluated}
 
-trait_selection_auto_deref_reached_recursion_limit = reached the recursion limit while auto-dereferencing `{$ty}`
-    .label = deref recursion limit reached
-    .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
-
 trait_selection_empty_on_clause_in_rustc_on_unimplemented = empty `on`-clause in `#[rustc_on_unimplemented]`
     .label = empty on-clause here
 
diff --git a/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl b/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
index 1040ee1c9..abe65a0e3 100644
--- a/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/ty_utils.ftl
@@ -10,17 +10,17 @@ ty_utils_address_and_deref_not_supported = dereferencing or taking the address i
 
 ty_utils_array_not_supported = array construction is not supported in generic constants
 
-ty_utils_block_not_supported = blocks are not supported in generic constant
+ty_utils_block_not_supported = blocks are not supported in generic constants
 
-ty_utils_never_to_any_not_supported = converting nevers to any is not supported in generic constant
+ty_utils_never_to_any_not_supported = converting nevers to any is not supported in generic constants
 
 ty_utils_tuple_not_supported = tuple construction is not supported in generic constants
 
-ty_utils_index_not_supported = indexing is not supported in generic constant
+ty_utils_index_not_supported = indexing is not supported in generic constants
 
-ty_utils_field_not_supported = field access is not supported in generic constant
+ty_utils_field_not_supported = field access is not supported in generic constants
 
-ty_utils_const_block_not_supported = const blocks are not supported in generic constant
+ty_utils_const_block_not_supported = const blocks are not supported in generic constants
 
 ty_utils_adt_not_supported = struct/enum construction is not supported in generic constants
 
@@ -44,4 +44,4 @@ ty_utils_control_flow_not_supported = control flow is not supported in generic c
 
 ty_utils_inline_asm_not_supported = assembly is not supported in generic constants
 
-ty_utils_operation_not_supported = unsupported operation in generic constant
+ty_utils_operation_not_supported = unsupported operation in generic constants
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 418ba3c74..37a51980a 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -57,6 +57,7 @@ fluent_messages! {
     lint => "../locales/en-US/lint.ftl",
     metadata => "../locales/en-US/metadata.ftl",
     middle => "../locales/en-US/middle.ftl",
+    mir_build => "../locales/en-US/mir_build.ftl",
     mir_dataflow => "../locales/en-US/mir_dataflow.ftl",
     monomorphize => "../locales/en-US/monomorphize.ftl",
     parse => "../locales/en-US/parse.ftl",
@@ -380,7 +381,7 @@ impl<S: Into<String>> From<S> for DiagnosticMessage {
     }
 }
 
-/// A workaround for "good path" ICEs when formatting types in disables lints.
+/// A workaround for "good path" ICEs when formatting types in disabled lints.
 ///
 /// Delays formatting until `.into(): DiagnosticMessage` is used.
 pub struct DelayDm<F>(pub F);
@@ -548,9 +549,7 @@ fn icu_locale_from_unic_langid(lang: LanguageIdentifier) -> Option<icu_locid::Lo
     icu_locid::Locale::try_from_bytes(lang.to_string().as_bytes()).ok()
 }
 
-pub fn fluent_value_from_str_list_sep_by_and<'source>(
-    l: Vec<Cow<'source, str>>,
-) -> FluentValue<'source> {
+pub fn fluent_value_from_str_list_sep_by_and(l: Vec<Cow<'_, str>>) -> FluentValue<'_> {
     // Fluent requires 'static value here for its AnyEq usages.
     #[derive(Clone, PartialEq, Debug)]
     struct FluentStrListSepByAnd(Vec<String>);