From 1376c5a617be5c25655d0d7cb63e3beaa5a6e026 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:20:39 +0200 Subject: Merging upstream version 1.70.0+dfsg1. Signed-off-by: Daniel Baumann --- .../consts/const-eval/transmute-size-mismatch.rs | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 tests/ui/consts/const-eval/transmute-size-mismatch.rs (limited to 'tests/ui/consts/const-eval/transmute-size-mismatch.rs') 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(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() {} -- cgit v1.2.3