rust/tests/ui/mir/mir_codegen_ssa.rs

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// build-pass
// compile-flags: --crate-type=lib
#![feature(custom_mir, core_intrinsics)]
use std::intrinsics::mir::*;
#[custom_mir(dialect = "runtime", phase = "optimized")]
pub fn f(a: u32) -> u32 {
mir!(
let x: u32;
{
// Previously code generation failed with ICE "use of .. before def ..." because the
// definition of x was incorrectly identified as dominating the use of x located in the
// same statement:
x = x + a;
RET = x;
Return()
}
)
}