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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/variance/variance-covariant-self-trait-match.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/variance/variance-covariant-self-trait-match.rs b/src/test/ui/variance/variance-covariant-self-trait-match.rs new file mode 100644 index 000000000..93c25e980 --- /dev/null +++ b/src/test/ui/variance/variance-covariant-self-trait-match.rs @@ -0,0 +1,27 @@ +#![allow(dead_code)] + +// Test that even when `Self` is only used in covariant position, it +// is treated as invariant. + +trait Get { + fn get() -> Self; +} + +fn get_min_from_max<'min, 'max, G>() + where 'max : 'min, G : 'max, &'max G : Get +{ + // Previously OK, now an error as traits are invariant. + impls_get::<&'min G>(); + //~^ ERROR lifetime may not live long enough +} + +fn get_max_from_min<'min, 'max, G>() + where 'max : 'min, G : 'max, &'min G : Get +{ + impls_get::<&'max G>(); + //~^ ERROR lifetime may not live long enough +} + +fn impls_get<G>() where G : Get { } + +fn main() { } |