45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
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//@ run-pass
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//@ revisions: mir codegen
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//@[mir] compile-flags: -Zmir-opt-level=3
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//@[codegen] compile-flags: -Zmir-opt-level=0
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// A regression test for #107205
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#![allow(coherence_leak_check)]
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struct Foo<T: 'static>(T);
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fn useful<'a>(_: &'a u8) {}
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trait GetInner {
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type Assoc;
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fn muahaha(&mut self) -> Self::Assoc;
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}
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impl GetInner for Foo<fn(&'static u8)> {
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type Assoc = String;
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fn muahaha(&mut self) -> String {
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String::from("I am a string")
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}
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}
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impl GetInner for Foo<for<'a> fn(&'a u8)> {
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type Assoc = [usize; 3];
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fn muahaha(&mut self) -> [usize; 3] {
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[100; 3]
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}
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}
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fn break_me(hr_fnptr: Box<Foo::<for<'a> fn(&'a u8)>>) -> Box<dyn GetInner<Assoc = String>> {
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let lr_fnptr = hr_fnptr as Box<Foo<fn(&'static u8)>>;
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lr_fnptr as Box<dyn GetInner<Assoc = String>>
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}
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fn main() {
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drop(Box::new(Foo(useful as fn(&'static u8))) as Box<dyn GetInner<Assoc = String>>);
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drop(Box::new(Foo(useful as fn(&u8))) as Box<dyn GetInner<Assoc = [usize; 3]>>);
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let mut any = break_me(Box::new(Foo(useful)));
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let evil_string = any.muahaha();
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assert_eq!(evil_string, "I am a string");
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}
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