mirror of https://github.com/rust-lang/rust
26 lines
725 B
Rust
26 lines
725 B
Rust
//@ test-mir-pass: SimplifyCfg-pre-optimizations
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// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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// Retagging (from Stacked Borrows) relies on the array index being a fresh
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// temporary, so that side-effects cannot change it.
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// Test that this is indeed the case.
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unsafe fn foo(z: *mut usize) -> u32 {
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*z = 2;
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99
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}
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// EMIT_MIR array_index_is_temporary.main.SimplifyCfg-pre-optimizations.after.mir
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fn main() {
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// CHECK-LABEL: fn main(
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// CHECK: debug x => [[x:_.*]];
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// CHECK: debug y => [[y:_.*]];
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// CHECK: [[y]] = const 1_usize;
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// CHECK: [[tmp:_.*]] = [[y]];
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// CHECK: [[x]][[[tmp]]] =
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let mut x = [42, 43, 44];
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let mut y = 1;
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let z: *mut usize = &mut y;
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x[y] = unsafe { foo(z) };
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}
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