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Diffstat (limited to 'tests/ui/coherence/coherence-subtyping.rs')
-rw-r--r-- | tests/ui/coherence/coherence-subtyping.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/coherence/coherence-subtyping.rs b/tests/ui/coherence/coherence-subtyping.rs new file mode 100644 index 000000000..b3ed728a8 --- /dev/null +++ b/tests/ui/coherence/coherence-subtyping.rs @@ -0,0 +1,20 @@ +// Test that two distinct impls which match subtypes of one another +// yield coherence errors (or not) depending on the variance. +// +// Note: This scenario is currently accepted, but as part of the +// universe transition (#56105) may eventually become an error. + +// check-pass + +trait TheTrait { + fn foo(&self) {} +} + +impl TheTrait for for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8 {} + +impl TheTrait for for<'a> fn(&'a u8, &'a u8) -> &'a u8 { + //~^ WARNING conflicting implementation + //~^^ WARNING this was previously accepted by the compiler but is being phased out +} + +fn main() {} |