diff options
Diffstat (limited to 'tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr')
| -rw-r--r-- | tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr | 666 |
1 files changed, 666 insertions, 0 deletions
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr new file mode 100644 index 000000000..13e806a43 --- /dev/null +++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr @@ -0,0 +1,666 @@ +error: unsupported type attribute for diagnostic derive enum + --> $DIR/diagnostic-derive.rs:39:1 + | +LL | #[diag(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:42:5 + | +LL | Foo, + | ^^^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:44:5 + | +LL | Bar, + | ^^^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[diag = ...]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:50:1 + | +LL | #[diag = "E0123"] + | ^^^^^^^^^^^^^^^^^ + +error: `#[nonsense(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:55:1 + | +LL | #[nonsense(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:55:1 + | +LL | / #[nonsense(compiletest_example, code = "E0123")] +LL | | +LL | | +LL | | +LL | | struct InvalidStructAttr {} + | |___________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[diag("...")]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:62:8 + | +LL | #[diag("E0123")] + | ^^^^^^^ + | + = help: a diagnostic slug is required as the first argument + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:62:1 + | +LL | / #[diag("E0123")] +LL | | +LL | | +LL | | struct InvalidLitNestedAttr {} + | |______________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[diag(nonsense(...))]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:73:8 + | +LL | #[diag(nonsense("foo"), code = "E0123", slug = "foo")] + | ^^^^^^^^^^^^^^^ + | + = help: a diagnostic slug is required as the first argument + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:73:1 + | +LL | / #[diag(nonsense("foo"), code = "E0123", slug = "foo")] +LL | | +LL | | +LL | | struct InvalidNestedStructAttr1 {} + | |__________________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[diag(nonsense = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:79:8 + | +LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")] + | ^^^^^^^^^^^^^^^^ + | + = help: only `code` is a valid nested attributes following the slug + +error: `#[diag(slug = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:79:42 + | +LL | #[diag(nonsense = "...", code = "E0123", slug = "foo")] + | ^^^^^^^^^^^^ + | + = help: only `code` is a valid nested attributes following the slug + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:79:1 + | +LL | / #[diag(nonsense = "...", code = "E0123", slug = "foo")] +LL | | +LL | | +LL | | +LL | | struct InvalidNestedStructAttr2 {} + | |__________________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[diag(nonsense = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:86:8 + | +LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")] + | ^^^^^^^^^^^^ + +error: `#[diag(slug = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:86:38 + | +LL | #[diag(nonsense = 4, code = "E0123", slug = "foo")] + | ^^^^^^^^^^^^ + | + = help: only `code` is a valid nested attributes following the slug + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:86:1 + | +LL | / #[diag(nonsense = 4, code = "E0123", slug = "foo")] +LL | | +LL | | +LL | | +LL | | struct InvalidNestedStructAttr3 {} + | |__________________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[diag(slug = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:93:45 + | +LL | #[diag(compiletest_example, code = "E0123", slug = "foo")] + | ^^^^^^^^^^^^ + | + = help: only `code` is a valid nested attributes following the slug + +error: `#[suggestion = ...]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:100:5 + | +LL | #[suggestion = "bar"] + | ^^^^^^^^^^^^^^^^^^^^^ + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:107:8 + | +LL | #[diag(compiletest_example, code = "E0456")] + | ^^^^^^^^^^^^^^^^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:106:8 + | +LL | #[diag(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^ + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:107:36 + | +LL | #[diag(compiletest_example, code = "E0456")] + | ^^^^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:106:36 + | +LL | #[diag(compiletest_example, code = "E0123")] + | ^^^^^^^ + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:113:52 + | +LL | #[diag(compiletest_example, code = "E0456", code = "E0457")] + | ^^^^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:113:36 + | +LL | #[diag(compiletest_example, code = "E0456", code = "E0457")] + | ^^^^^^^ + +error: `#[diag(compiletest_example)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:118:29 + | +LL | #[diag(compiletest_example, compiletest_example, code = "E0456")] + | ^^^^^^^^^^^^^^^^^^^ + | + = help: diagnostic slug must be the first argument + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:123:1 + | +LL | struct KindNotProvided {} + | ^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:126:1 + | +LL | / #[diag(code = "E0456")] +LL | | +LL | | struct SlugNotProvided {} + | |_________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: the `#[primary_span]` attribute can only be applied to fields of type `Span` or `MultiSpan` + --> $DIR/diagnostic-derive.rs:137:5 + | +LL | #[primary_span] + | ^^^^^^^^^^^^^^^ + +error: `#[nonsense]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:145:5 + | +LL | #[nonsense] + | ^^^^^^^^^^^ + +error: the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan` + --> $DIR/diagnostic-derive.rs:162:5 + | +LL | #[label(label)] + | ^^^^^^^^^^^^^^^ + +error: `name` doesn't refer to a field on this type + --> $DIR/diagnostic-derive.rs:170:37 + | +LL | #[suggestion(suggestion, code = "{name}")] + | ^^^^^^^^ + +error: invalid format string: expected `'}'` but string was terminated + --> $DIR/diagnostic-derive.rs:175:10 + | +LL | #[derive(Diagnostic)] + | ^^^^^^^^^^ expected `'}'` in format string + | + = note: if you intended to print `{`, you can escape it using `{{` + = note: this error originates in the derive macro `Diagnostic` (in Nightly builds, run with -Z macro-backtrace for more info) + +error: invalid format string: unmatched `}` found + --> $DIR/diagnostic-derive.rs:185:10 + | +LL | #[derive(Diagnostic)] + | ^^^^^^^^^^ unmatched `}` in format string + | + = note: if you intended to print `}`, you can escape it using `}}` + = note: this error originates in the derive macro `Diagnostic` (in Nightly builds, run with -Z macro-backtrace for more info) + +error: the `#[label(...)]` attribute can only be applied to fields of type `Span` or `MultiSpan` + --> $DIR/diagnostic-derive.rs:205:5 + | +LL | #[label(label)] + | ^^^^^^^^^^^^^^^ + +error: suggestion without `code = "..."` + --> $DIR/diagnostic-derive.rs:224:5 + | +LL | #[suggestion(suggestion)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `#[suggestion(nonsense = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:232:18 + | +LL | #[suggestion(nonsense = "bar")] + | ^^^^^^^^^^^^^^^^ + | + = help: only `style`, `code` and `applicability` are valid nested attributes + +error: suggestion without `code = "..."` + --> $DIR/diagnostic-derive.rs:232:5 + | +LL | #[suggestion(nonsense = "bar")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `#[suggestion(msg = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:241:18 + | +LL | #[suggestion(msg = "bar")] + | ^^^^^^^^^^^ + | + = help: only `style`, `code` and `applicability` are valid nested attributes + +error: suggestion without `code = "..."` + --> $DIR/diagnostic-derive.rs:241:5 + | +LL | #[suggestion(msg = "bar")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: wrong field type for suggestion + --> $DIR/diagnostic-derive.rs:264:5 + | +LL | / #[suggestion(suggestion, code = "This is suggested code")] +LL | | +LL | | suggestion: Applicability, + | |_____________________________^ + | + = help: `#[suggestion(...)]` should be applied to fields of type `Span` or `(Span, Applicability)` + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:280:24 + | +LL | suggestion: (Span, Span, Applicability), + | ^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:280:18 + | +LL | suggestion: (Span, Span, Applicability), + | ^^^^ + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:288:33 + | +LL | suggestion: (Applicability, Applicability, Span), + | ^^^^^^^^^^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:288:18 + | +LL | suggestion: (Applicability, Applicability, Span), + | ^^^^^^^^^^^^^ + +error: `#[label = ...]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:295:5 + | +LL | #[label = "bar"] + | ^^^^^^^^^^^^^^^^ + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:446:44 + | +LL | #[suggestion(suggestion, code = "...", applicability = "maybe-incorrect")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:448:24 + | +LL | suggestion: (Span, Applicability), + | ^^^^^^^^^^^^^ + +error: invalid applicability + --> $DIR/diagnostic-derive.rs:454:44 + | +LL | #[suggestion(suggestion, code = "...", applicability = "batman")] + | ^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `#[label(foo)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:517:20 + | +LL | #[label(label, foo)] + | ^^^ + | + = help: a diagnostic slug must be the first argument to the attribute + +error: `#[label(foo = ...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:525:20 + | +LL | #[label(label, foo = "...")] + | ^^^^^^^^^^^ + +error: `#[label(foo(...))]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:533:20 + | +LL | #[label(label, foo("..."))] + | ^^^^^^^^^^ + +error: `#[primary_span]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:545:5 + | +LL | #[primary_span] + | ^^^^^^^^^^^^^^^ + | + = help: the `primary_span` field attribute is not valid for lint diagnostics + +error: `#[error(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:565:1 + | +LL | #[error(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:565:1 + | +LL | / #[error(compiletest_example, code = "E0123")] +LL | | +LL | | +LL | | +LL | | struct ErrorAttribute {} + | |________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[warn_(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:572:1 + | +LL | #[warn_(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:572:1 + | +LL | / #[warn_(compiletest_example, code = "E0123")] +LL | | +LL | | +LL | | +LL | | struct WarnAttribute {} + | |_______________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[lint(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:579:1 + | +LL | #[lint(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:579:1 + | +LL | / #[lint(compiletest_example, code = "E0123")] +LL | | +LL | | +LL | | +LL | | struct LintAttributeOnSessionDiag {} + | |____________________________________^ + | + = help: specify the slug as the first argument to the `#[diag(...)]` attribute, such as `#[diag(hir_analysis_example_error)]` + +error: `#[lint(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:586:1 + | +LL | #[lint(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `#[lint(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:586:1 + | +LL | #[lint(compiletest_example, code = "E0123")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: diagnostic slug not specified + --> $DIR/diagnostic-derive.rs:586:1 + | +LL | / #[lint(compiletest_example, code = "E0123")] +LL | | +LL | | +LL | | +LL | | +LL | | struct LintAttributeOnLintDiag {} + | |_________________________________^ + | + = help: specify the slug as the first argument to the attribute, such as `#[diag(compiletest_example)]` + +error: specified multiple times + --> $DIR/diagnostic-derive.rs:596:44 + | +LL | #[suggestion(suggestion, code = "...", code = ",,,")] + | ^^^^^^^^^^^^ + | +note: previously specified here + --> $DIR/diagnostic-derive.rs:596:30 + | +LL | #[suggestion(suggestion, code = "...", code = ",,,")] + | ^^^^^^^^^^^^ + +error: wrong types for suggestion + --> $DIR/diagnostic-derive.rs:605:24 + | +LL | suggestion: (Span, usize), + | ^^^^^ + | + = help: `#[suggestion(...)]` on a tuple field must be applied to fields of type `(Span, Applicability)` + +error: wrong types for suggestion + --> $DIR/diagnostic-derive.rs:613:17 + | +LL | suggestion: (Span,), + | ^^^^^^^ + | + = help: `#[suggestion(...)]` on a tuple field must be applied to fields of type `(Span, Applicability)` + +error: suggestion without `code = "..."` + --> $DIR/diagnostic-derive.rs:620:5 + | +LL | #[suggestion(suggestion)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `#[multipart_suggestion(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:627:1 + | +LL | #[multipart_suggestion(suggestion)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider creating a `Subdiagnostic` instead + +error: `#[multipart_suggestion(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:630:1 + | +LL | #[multipart_suggestion()] + | ^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider creating a `Subdiagnostic` instead + +error: `#[multipart_suggestion(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:634:5 + | +LL | #[multipart_suggestion(suggestion)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider creating a `Subdiagnostic` instead + +error: `#[suggestion(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:642:1 + | +LL | #[suggestion(suggestion, code = "...")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: `#[label]` and `#[suggestion]` can only be applied to fields + +error: `#[label]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:651:1 + | +LL | #[label] + | ^^^^^^^^ + | + = help: `#[label]` and `#[suggestion]` can only be applied to fields + +error: `#[subdiagnostic(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:685:5 + | +LL | #[subdiagnostic(bad)] + | ^^^^^^^^^^^^^^^^^^^^^ + | + = help: `eager` is the only supported nested attribute for `subdiagnostic` + +error: `#[subdiagnostic = ...]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:693:5 + | +LL | #[subdiagnostic = "bad"] + | ^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `#[subdiagnostic(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:701:5 + | +LL | #[subdiagnostic(bad, bad)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: `eager` is the only supported nested attribute for `subdiagnostic` + +error: `#[subdiagnostic(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:709:5 + | +LL | #[subdiagnostic("bad")] + | ^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: `eager` is the only supported nested attribute for `subdiagnostic` + +error: `#[subdiagnostic(...)]` is not a valid attribute + --> $DIR/diagnostic-derive.rs:717:5 + | +LL | #[subdiagnostic(eager)] + | ^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: eager subdiagnostics are not supported on lints + +error: expected at least one string literal for `code(...)` + --> $DIR/diagnostic-derive.rs:775:18 + | +LL | #[suggestion(code())] + | ^^^^^^ + +error: `code(...)` must contain only string literals + --> $DIR/diagnostic-derive.rs:783:23 + | +LL | #[suggestion(code(foo))] + | ^^^ + +error: `code = "..."`/`code(...)` must contain only string literals + --> $DIR/diagnostic-derive.rs:791:18 + | +LL | #[suggestion(code = 3)] + | ^^^^^^^^ + +error: cannot find attribute `nonsense` in this scope + --> $DIR/diagnostic-derive.rs:55:3 + | +LL | #[nonsense(compiletest_example, code = "E0123")] + | ^^^^^^^^ + +error: cannot find attribute `nonsense` in this scope + --> $DIR/diagnostic-derive.rs:145:7 + | +LL | #[nonsense] + | ^^^^^^^^ + +error: cannot find attribute `error` in this scope + --> $DIR/diagnostic-derive.rs:565:3 + | +LL | #[error(compiletest_example, code = "E0123")] + | ^^^^^ + +error: cannot find attribute `warn_` in this scope + --> $DIR/diagnostic-derive.rs:572:3 + | +LL | #[warn_(compiletest_example, code = "E0123")] + | ^^^^^ help: a built-in attribute with a similar name exists: `warn` + +error: cannot find attribute `lint` in this scope + --> $DIR/diagnostic-derive.rs:579:3 + | +LL | #[lint(compiletest_example, code = "E0123")] + | ^^^^ help: a built-in attribute with a similar name exists: `link` + +error: cannot find attribute `lint` in this scope + --> $DIR/diagnostic-derive.rs:586:3 + | +LL | #[lint(compiletest_example, code = "E0123")] + | ^^^^ help: a built-in attribute with a similar name exists: `link` + +error: cannot find attribute `multipart_suggestion` in this scope + --> $DIR/diagnostic-derive.rs:627:3 + | +LL | #[multipart_suggestion(suggestion)] + | ^^^^^^^^^^^^^^^^^^^^ + +error: cannot find attribute `multipart_suggestion` in this scope + --> $DIR/diagnostic-derive.rs:630:3 + | +LL | #[multipart_suggestion()] + | ^^^^^^^^^^^^^^^^^^^^ + +error: cannot find attribute `multipart_suggestion` in this scope + --> $DIR/diagnostic-derive.rs:634:7 + | +LL | #[multipart_suggestion(suggestion)] + | ^^^^^^^^^^^^^^^^^^^^ + +error[E0425]: cannot find value `nonsense` in module `rustc_errors::fluent` + --> $DIR/diagnostic-derive.rs:68:8 + | +LL | #[diag(nonsense, code = "E0123")] + | ^^^^^^^^ not found in `rustc_errors::fluent` + +error[E0277]: the trait bound `Hello: IntoDiagnosticArg` is not satisfied + --> $DIR/diagnostic-derive.rs:339:10 + | +LL | #[derive(Diagnostic)] + | ^^^^^^^^^^ the trait `IntoDiagnosticArg` is not implemented for `Hello` + | + = help: normalized in stderr +note: required by a bound in `DiagnosticBuilder::<'a, G>::set_arg` + --> $COMPILER_DIR/rustc_errors/src/diagnostic_builder.rs:LL:CC + = note: this error originates in the derive macro `Diagnostic` which comes from the expansion of the macro `forward` (in Nightly builds, run with -Z macro-backtrace for more info) + +error: aborting due to 83 previous errors + +Some errors have detailed explanations: E0277, E0425. +For more information about an error, try `rustc --explain E0277`. |