Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

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

4 files changed, 259 insertions, 0 deletions

diff --git a/src/test/ui/transmutability/arrays/should_have_correct_length.rs b/src/test/ui/transmutability/arrays/should_have_correct_length.rs
new file mode 100644
index 000000000..bfe6d830a
--- /dev/null
+++ b/src/test/ui/transmutability/arrays/should_have_correct_length.rs
@@ -0,0 +1,44 @@
+// check-pass
+//! An array must have the correct length.
+
+#![crate_type = "lib"]
+#![feature(transmutability)]
+#![allow(dead_code, incomplete_features, non_camel_case_types)]
+
+mod assert {
+    use std::mem::BikeshedIntrinsicFrom;
+    pub struct Context;
+
+    pub fn is_maybe_transmutable<Src, Dst>()
+    where
+        Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+    {}
+}
+
+fn should_have_len_0() {
+    type Array = [u8; 0];
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<Array, Struct>();
+    assert::is_maybe_transmutable::<Struct, Array>();
+}
+
+fn should_have_len_1() {
+    type Array = [u8; 1];
+    #[repr(C)] struct Struct(u8);
+    assert::is_maybe_transmutable::<Array, Struct>();
+    assert::is_maybe_transmutable::<Struct, Array>();
+}
+
+fn should_have_len_2() {
+    type Array = [u8; 2];
+    #[repr(C)] struct Struct(u8, u8);
+    assert::is_maybe_transmutable::<Array, Struct>();
+    assert::is_maybe_transmutable::<Struct, Array>();
+}
+
+fn should_have_len_3() {
+    type Array = [u8; 3];
+    #[repr(C)] struct Struct(u8, u8, u8);
+    assert::is_maybe_transmutable::<Array, Struct>();
+    assert::is_maybe_transmutable::<Struct, Array>();
+}
diff --git a/src/test/ui/transmutability/arrays/should_inherit_alignment.rs b/src/test/ui/transmutability/arrays/should_inherit_alignment.rs
new file mode 100644
index 000000000..fcb1765ea
--- /dev/null
+++ b/src/test/ui/transmutability/arrays/should_inherit_alignment.rs
@@ -0,0 +1,55 @@
+// check-pass
+//! An array must inherit the alignment of its inner type.
+
+#![crate_type = "lib"]
+#![feature(transmutability)]
+#![allow(dead_code, incomplete_features, non_camel_case_types)]
+
+mod assert {
+    use std::mem::BikeshedIntrinsicFrom;
+    pub struct Context;
+
+    pub fn is_maybe_transmutable<Src, Dst>()
+    where
+        Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+    {}
+}
+
+#[derive(Clone, Copy)] #[repr(u8)] enum Ox00 { V = 0x00 }
+#[derive(Clone, Copy)] #[repr(u8)] enum Ox01 { V = 0x01 }
+#[derive(Clone, Copy)] #[repr(u8)] enum OxFF { V = 0xFF }
+
+#[repr(C)]
+union Uninit {
+    a: (),
+    b: OxFF,
+}
+
+#[repr(C, align(2))] struct align_2(Ox00);
+
+fn len_0() {
+    #[repr(C)] struct ImplicitlyPadded([align_2; 0], Ox01);
+    #[repr(C)] struct ExplicitlyPadded(Ox01, Uninit);
+
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
+    assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
+}
+
+fn len_1() {
+    #[repr(C)] struct ImplicitlyPadded([align_2; 1], Ox01);
+    #[repr(C)] struct ExplicitlyPadded(Ox00, Uninit, Ox01, Uninit);
+
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
+    assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
+}
+
+fn len_2() {
+    #[repr(C)] struct ImplicitlyPadded([align_2; 2], Ox01);
+    #[repr(C)] struct ExplicitlyPadded(Ox00, Uninit, Ox00, Uninit, Ox01, Uninit);
+
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
+    assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
+}
diff --git a/src/test/ui/transmutability/arrays/should_require_well_defined_layout.rs b/src/test/ui/transmutability/arrays/should_require_well_defined_layout.rs
new file mode 100644
index 000000000..8e69527c1
--- /dev/null
+++ b/src/test/ui/transmutability/arrays/should_require_well_defined_layout.rs
@@ -0,0 +1,61 @@
+//! An array must have a well-defined layout to participate in a transmutation.
+
+#![crate_type = "lib"]
+#![feature(transmutability)]
+#![allow(dead_code, incomplete_features, non_camel_case_types)]
+
+mod assert {
+    use std::mem::BikeshedIntrinsicFrom;
+    pub struct Context;
+
+    pub fn is_maybe_transmutable<Src, Dst>()
+    where
+        Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+    {}
+}
+
+fn should_reject_repr_rust()
+{
+    fn unit() {
+        type repr_rust = [String; 0];
+        assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted
+        assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted
+    }
+
+    fn singleton() {
+        type repr_rust = [String; 1];
+        assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted
+        assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted
+    }
+
+    fn duplex() {
+        type repr_rust = [String; 2];
+        assert::is_maybe_transmutable::<repr_rust, ()>(); //~ ERROR cannot be safely transmuted
+        assert::is_maybe_transmutable::<u128, repr_rust>(); //~ ERROR cannot be safely transmuted
+    }
+}
+
+fn should_accept_repr_C()
+{
+    fn unit() {
+        #[repr(C)] struct repr_c(u8, u16, u8);
+        type array = [repr_c; 0];
+        assert::is_maybe_transmutable::<array, ()>();
+        assert::is_maybe_transmutable::<i128, array>();
+    }
+
+    fn singleton() {
+        #[repr(C)] struct repr_c(u8, u16, u8);
+        type array = [repr_c; 1];
+        assert::is_maybe_transmutable::<array, repr_c>();
+        assert::is_maybe_transmutable::<repr_c, array>();
+    }
+
+    fn duplex() {
+        #[repr(C)] struct repr_c(u8, u16, u8);
+        #[repr(C)] struct duplex(repr_c, repr_c);
+        type array = [repr_c; 2];
+        assert::is_maybe_transmutable::<array, duplex>();
+        assert::is_maybe_transmutable::<duplex, array>();
+    }
+}
diff --git a/src/test/ui/transmutability/arrays/should_require_well_defined_layout.stderr b/src/test/ui/transmutability/arrays/should_require_well_defined_layout.stderr
new file mode 100644
index 000000000..eae0c947d
--- /dev/null
+++ b/src/test/ui/transmutability/arrays/should_require_well_defined_layout.stderr
@@ -0,0 +1,99 @@
+error[E0277]: `[String; 0]` cannot be safely transmuted into `()` in the defining scope of `assert::Context`.
+  --> $DIR/should_require_well_defined_layout.rs:21:52
+   |
+LL |         assert::is_maybe_transmutable::<repr_rust, ()>();
+   |                                                    ^^ `[String; 0]` cannot be safely transmuted into `()` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<[String; 0], assert::Context, true, true, true, true>` is not implemented for `()`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/should_require_well_defined_layout.rs:13:14
+   |
+LL |     pub fn is_maybe_transmutable<Src, Dst>()
+   |            --------------------- required by a bound in this
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_maybe_transmutable`
+
+error[E0277]: `u128` cannot be safely transmuted into `[String; 0]` in the defining scope of `assert::Context`.
+  --> $DIR/should_require_well_defined_layout.rs:22:47
+   |
+LL |         assert::is_maybe_transmutable::<u128, repr_rust>();
+   |                                               ^^^^^^^^^ `u128` cannot be safely transmuted into `[String; 0]` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, true, true, true, true>` is not implemented for `[String; 0]`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/should_require_well_defined_layout.rs:13:14
+   |
+LL |     pub fn is_maybe_transmutable<Src, Dst>()
+   |            --------------------- required by a bound in this
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_maybe_transmutable`
+
+error[E0277]: `[String; 1]` cannot be safely transmuted into `()` in the defining scope of `assert::Context`.
+  --> $DIR/should_require_well_defined_layout.rs:27:52
+   |
+LL |         assert::is_maybe_transmutable::<repr_rust, ()>();
+   |                                                    ^^ `[String; 1]` cannot be safely transmuted into `()` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<[String; 1], assert::Context, true, true, true, true>` is not implemented for `()`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/should_require_well_defined_layout.rs:13:14
+   |
+LL |     pub fn is_maybe_transmutable<Src, Dst>()
+   |            --------------------- required by a bound in this
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_maybe_transmutable`
+
+error[E0277]: `u128` cannot be safely transmuted into `[String; 1]` in the defining scope of `assert::Context`.
+  --> $DIR/should_require_well_defined_layout.rs:28:47
+   |
+LL |         assert::is_maybe_transmutable::<u128, repr_rust>();
+   |                                               ^^^^^^^^^ `u128` cannot be safely transmuted into `[String; 1]` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, true, true, true, true>` is not implemented for `[String; 1]`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/should_require_well_defined_layout.rs:13:14
+   |
+LL |     pub fn is_maybe_transmutable<Src, Dst>()
+   |            --------------------- required by a bound in this
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_maybe_transmutable`
+
+error[E0277]: `[String; 2]` cannot be safely transmuted into `()` in the defining scope of `assert::Context`.
+  --> $DIR/should_require_well_defined_layout.rs:33:52
+   |
+LL |         assert::is_maybe_transmutable::<repr_rust, ()>();
+   |                                                    ^^ `[String; 2]` cannot be safely transmuted into `()` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<[String; 2], assert::Context, true, true, true, true>` is not implemented for `()`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/should_require_well_defined_layout.rs:13:14
+   |
+LL |     pub fn is_maybe_transmutable<Src, Dst>()
+   |            --------------------- required by a bound in this
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_maybe_transmutable`
+
+error[E0277]: `u128` cannot be safely transmuted into `[String; 2]` in the defining scope of `assert::Context`.
+  --> $DIR/should_require_well_defined_layout.rs:34:47
+   |
+LL |         assert::is_maybe_transmutable::<u128, repr_rust>();
+   |                                               ^^^^^^^^^ `u128` cannot be safely transmuted into `[String; 2]` in the defining scope of `assert::Context`.
+   |
+   = help: the trait `BikeshedIntrinsicFrom<u128, assert::Context, true, true, true, true>` is not implemented for `[String; 2]`
+note: required by a bound in `is_maybe_transmutable`
+  --> $DIR/should_require_well_defined_layout.rs:13:14
+   |
+LL |     pub fn is_maybe_transmutable<Src, Dst>()
+   |            --------------------- required by a bound in this
+LL |     where
+LL |         Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true>
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_maybe_transmutable`
+
+error: aborting due to 6 previous errors
+
+For more information about this error, try `rustc --explain E0277`.