rust/tests/mir-opt/const_prop/boxes.rs

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// unit-test: ConstProp
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// compile-flags: -O
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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#![feature(rustc_attrs, stmt_expr_attributes)]
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// Note: this test verifies that we, in fact, do not const prop `#[rustc_box]`
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// EMIT_MIR boxes.main.ConstProp.diff
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fn main() {
let x = *(#[rustc_box]
Box::new(42))
+ 0;
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}