40 lines
827 B
Rust
40 lines
827 B
Rust
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// unit-test: CopyProp
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#![feature(custom_mir, core_intrinsics)]
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#![allow(unused_assignments)]
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extern crate core;
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use core::intrinsics::mir::*;
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fn opaque(_: impl Sized) -> bool { true }
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fn cmp_ref(a: &u8, b: &u8) -> bool {
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std::ptr::eq(a as *const u8, b as *const u8)
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}
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#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
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fn f() -> bool {
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mir!(
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{
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let a = 5_u8;
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let r1 = &a;
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let b = a;
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// We cannot propagate the place `a`.
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let r2 = &b;
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Call(RET, next, cmp_ref(r1, r2))
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}
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next = {
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// But we can propagate the value `a`.
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Call(RET, ret, opaque(b))
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}
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ret = {
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Return()
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}
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)
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}
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fn main() {
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assert!(!f());
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}
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// EMIT_MIR borrowed_local.f.CopyProp.diff
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