diff options
Diffstat (limited to 'tests/ui/nll/member-constraints/min-choice-reject-ambiguous.rs')
-rw-r--r-- | tests/ui/nll/member-constraints/min-choice-reject-ambiguous.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/tests/ui/nll/member-constraints/min-choice-reject-ambiguous.rs b/tests/ui/nll/member-constraints/min-choice-reject-ambiguous.rs new file mode 100644 index 000000000..52ea0f28d --- /dev/null +++ b/tests/ui/nll/member-constraints/min-choice-reject-ambiguous.rs @@ -0,0 +1,43 @@ +// ... continued from ./min-choice.rs + +// check-fail + +trait Cap<'a> {} +impl<T> Cap<'_> for T {} + +fn type_test<'a, T: 'a>() -> &'a u8 { &0 } + +// Make sure we don't pick `'b`. +fn test_b<'a, 'b, 'c, T>() -> impl Cap<'a> + Cap<'b> + Cap<'c> +where + 'a: 'b, + 'a: 'c, + T: 'b, +{ + type_test::<'_, T>() // This should pass if we pick 'b. + //~^ ERROR the parameter type `T` may not live long enough +} + +// Make sure we don't pick `'c`. +fn test_c<'a, 'b, 'c, T>() -> impl Cap<'a> + Cap<'b> + Cap<'c> +where + 'a: 'b, + 'a: 'c, + T: 'c, +{ + type_test::<'_, T>() // This should pass if we pick 'c. + //~^ ERROR the parameter type `T` may not live long enough +} + +// We need to pick min_choice from `['b, 'c]`, but it's ambiguous which one to pick because +// they're incomparable. +fn test_ambiguous<'a, 'b, 'c>(s: &'a u8) -> impl Cap<'b> + Cap<'c> +where + 'a: 'b, + 'a: 'c, +{ + s + //~^ ERROR captures lifetime that does not appear in bounds +} + +fn main() {} |