chore: checkpoint before Python removal

vendor/zerocopy/tests/ui/try_transmute_mut.rs

@@ -0,0 +1,49 @@
+// Copyright 2024 The Fuchsia Authors
+//
+// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
+// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
+// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
+// This file may not be copied, modified, or distributed except according to
+// those terms.
+
+include!("../include.rs");
+
+use util::{NotZerocopy, AU16};
+use zerocopy::try_transmute_mut;
+
+fn main() {
+    // `try_transmute_mut` requires that the destination type implements
+    // `IntoBytes`
+    let src = &mut AU16(0);
+    let dst_not_try_from_bytes: Result<&mut NotZerocopy, _> = try_transmute_mut!(src);
+    //~[msrv, stable, nightly]^ ERROR: the trait bound `NotZerocopy: TryFromBytes` is not satisfied
+    //~[msrv, stable, nightly]^^ ERROR: the trait bound `NotZerocopy: TryFromBytes` is not satisfied
+    //~[msrv, stable, nightly]^^^ ERROR: the trait bound `NotZerocopy: TryFromBytes` is not satisfied
+    //~[msrv, stable, nightly]^^^^ ERROR: the trait bound `NotZerocopy: IntoBytes` is not satisfied
+
+    #[derive(zerocopy::IntoBytes)]
+    #[repr(C)]
+    struct SrcA;
+
+    #[derive(zerocopy::TryFromBytes)]
+    #[repr(C)]
+    struct DstA;
+
+    // `try_transmute_mut` requires that the source type implements `FromBytes`
+    let src_not_from_bytes: &mut DstA = try_transmute_mut!(&mut SrcA).unwrap();
+    //~[msrv, stable, nightly]^ ERROR: the trait bound `SrcA: FromBytes` is not satisfied
+    //~[msrv, stable, nightly]^^ ERROR: the trait bound `DstA: IntoBytes` is not satisfied
+
+    #[derive(zerocopy::FromBytes)]
+    #[repr(C)]
+    struct SrcB;
+
+    #[derive(zerocopy::TryFromBytes)]
+    #[repr(C)]
+    struct DstB;
+
+    // `try_transmute_mut` requires that the source type implements `IntoBytes`
+    let src_not_from_bytes: &mut DstB = try_transmute_mut!(&mut SrcB).unwrap();
+    //~[msrv, stable, nightly]^ ERROR: the trait bound `SrcB: IntoBytes` is not satisfied
+    //~[msrv, stable, nightly]^^ ERROR: the trait bound `DstB: IntoBytes` is not satisfied
+}