mirror of https://github.com/rust-lang/rust
41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
// skip-filecheck
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// Regression test for #41697. Using dump-mir was triggering
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// artificial cycles: during type-checking, we had to get the MIR for
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// the constant expressions in `[u8; 2]`, which in turn would trigger
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// an attempt to get the def-path, which in turn would request the
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// types of the impl, which would trigger a cycle. We suppressed this
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// cycle now by forcing mir-dump to avoid asking for types of an impl.
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#![feature(rustc_attrs)]
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use std::sync::Arc;
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trait Foo {
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fn get(&self) -> [u8; 2];
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}
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// EMIT_MIR issue_41697.{impl#0}-{constant#0}.SimplifyCfg-promote-consts.after.mir
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impl Foo for [u8; 1 + 1] {
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fn get(&self) -> [u8; 2] {
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*self
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}
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}
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struct Bar<T: ?Sized>(T);
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fn unsize_fat_ptr<'a>(x: &'a Bar<Foo + Send + 'a>) -> &'a Bar<Foo + 'a> {
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x
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}
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fn unsize_nested_fat_ptr(x: Arc<Foo + Send>) -> Arc<Foo> {
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x
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}
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fn main() {
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let x: Box<Bar<Foo + Send>> = Box::new(Bar([1, 2]));
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assert_eq!(unsize_fat_ptr(&*x).0.get(), [1, 2]);
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let x: Arc<Foo + Send> = Arc::new([3, 4]);
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assert_eq!(unsize_nested_fat_ptr(x).get(), [3, 4]);
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}
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