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Diffstat (limited to '')
-rw-r--r-- | tests/ui/nll/member-constraints/min-choice.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/nll/member-constraints/min-choice.rs b/tests/ui/nll/member-constraints/min-choice.rs new file mode 100644 index 000000000..14b4dae7a --- /dev/null +++ b/tests/ui/nll/member-constraints/min-choice.rs @@ -0,0 +1,34 @@ +// Assuming that the hidden type in these tests is `&'_#15r u8`, +// we have a member constraint: `'_#15r member ['static, 'a, 'b, 'c]`. +// +// Make sure we pick up the minimum non-ambiguous region among them. +// We will have to exclude `['b, 'c]` because they're incomparable, +// and then we should pick `'a` because we know `'static: 'a`. + +// check-pass + +trait Cap<'a> {} +impl<T> Cap<'_> for T {} + +fn type_test<'a, T: 'a>() -> &'a u8 { &0 } + +// Basic test: make sure we don't bail out because 'b and 'c are incomparable. +fn basic<'a, 'b, 'c>() -> impl Cap<'a> + Cap<'b> + Cap<'c> +where + 'a: 'b, + 'a: 'c, +{ + &0 +} + +// Make sure we don't pick `'static`. +fn test_static<'a, 'b, 'c, T>() -> impl Cap<'a> + Cap<'b> + Cap<'c> +where + 'a: 'b, + 'a: 'c, + T: 'a, +{ + type_test::<'_, T>() // This will fail if we pick 'static +} + +fn main() {} |