diff options
Diffstat (limited to 'tests/ui/codegen/subtyping-impacts-selection-1.rs')
-rw-r--r-- | tests/ui/codegen/subtyping-impacts-selection-1.rs | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tests/ui/codegen/subtyping-impacts-selection-1.rs b/tests/ui/codegen/subtyping-impacts-selection-1.rs new file mode 100644 index 000000000..09e06f6d6 --- /dev/null +++ b/tests/ui/codegen/subtyping-impacts-selection-1.rs @@ -0,0 +1,44 @@ +// run-pass +// revisions: mir codegen +//[mir] compile-flags: -Zmir-opt-level=3 +//[codegen] compile-flags: -Zmir-opt-level=0 + +// A regression test for #107205 +#![allow(coherence_leak_check)] +struct Foo<T: 'static>(T); + +fn useful<'a>(_: &'a u8) {} + +trait GetInner { + type Assoc; + fn muahaha(&mut self) -> Self::Assoc; +} + +impl GetInner for Foo<fn(&'static u8)> { + type Assoc = String; + fn muahaha(&mut self) -> String { + String::from("I am a string") + } +} + +impl GetInner for Foo<for<'a> fn(&'a u8)> { + type Assoc = [usize; 3]; + fn muahaha(&mut self) -> [usize; 3] { + [100; 3] + } +} + +fn break_me(hr_fnptr: Box<Foo::<for<'a> fn(&'a u8)>>) -> Box<dyn GetInner<Assoc = String>> { + let lr_fnptr = hr_fnptr as Box<Foo<fn(&'static u8)>>; + lr_fnptr as Box<dyn GetInner<Assoc = String>> +} + +fn main() { + drop(Box::new(Foo(useful as fn(&'static u8))) as Box<dyn GetInner<Assoc = String>>); + drop(Box::new(Foo(useful as fn(&u8))) as Box<dyn GetInner<Assoc = [usize; 3]>>); + + let mut any = break_me(Box::new(Foo(useful))); + + let evil_string = any.muahaha(); + assert_eq!(evil_string, "I am a string"); +} |