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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:39 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:39 +0000 |
commit | 1376c5a617be5c25655d0d7cb63e3beaa5a6e026 (patch) | |
tree | 3bb8d61aee02bc7a15eab3f36e3b921afc2075d0 /tests/ui/consts/const-eval/transmute-size-mismatch.rs | |
parent | Releasing progress-linux version 1.69.0+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-1376c5a617be5c25655d0d7cb63e3beaa5a6e026.tar.xz rustc-1376c5a617be5c25655d0d7cb63e3beaa5a6e026.zip |
Merging upstream version 1.70.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/consts/const-eval/transmute-size-mismatch.rs')
-rw-r--r-- | tests/ui/consts/const-eval/transmute-size-mismatch.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/consts/const-eval/transmute-size-mismatch.rs b/tests/ui/consts/const-eval/transmute-size-mismatch.rs new file mode 100644 index 000000000..2410baea2 --- /dev/null +++ b/tests/ui/consts/const-eval/transmute-size-mismatch.rs @@ -0,0 +1,24 @@ +#![feature(core_intrinsics)] +#![feature(custom_mir)] + +// These cases are statically rejected by `mem::transmute`, so we need custom +// MIR to be able to get to constant evaluation. +use std::intrinsics::mir::*; + +#[custom_mir(dialect = "runtime", phase = "initial")] +const unsafe fn mir_transmute<T, U>(x: T) -> U { + mir!{ + { + RET = CastTransmute(x); + //~^ ERROR evaluation of constant value failed + //~| ERROR evaluation of constant value failed + Return() + } + } +} + +const FROM_BIGGER: u16 = unsafe { mir_transmute(123_i32) }; + +const FROM_SMALLER: u32 = unsafe { mir_transmute(123_i16) }; + +fn main() {} |