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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/nll/relate_tys/universe-violation.rs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/nll/relate_tys/universe-violation.rs b/src/test/ui/nll/relate_tys/universe-violation.rs new file mode 100644 index 000000000..c5f9d4406 --- /dev/null +++ b/src/test/ui/nll/relate_tys/universe-violation.rs @@ -0,0 +1,15 @@ +// Test that the NLL `relate_tys` code correctly deduces that a +// function returning either argument CANNOT be upcast to one +// that returns always its first argument. +// +// compile-flags:-Zno-leak-check + +fn make_it() -> fn(&'static u32) -> &'static u32 { + panic!() +} + +fn main() { + let a: fn(_) -> _ = make_it(); + let b: fn(&u32) -> &u32 = a; //~ ERROR mismatched types [E0308] + drop(a); +} |