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Diffstat (limited to 'src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unsuited.rs')
-rw-r--r-- | src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unsuited.rs | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unsuited.rs b/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unsuited.rs deleted file mode 100644 index adcbca2a4..000000000 --- a/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unsuited.rs +++ /dev/null @@ -1,39 +0,0 @@ -// edition:2018 - -trait Trait<'a, 'b> {} -impl<T> Trait<'_, '_> for T {} - -// `Ordinary<'a> <: Ordinary<'b>` if `'a: 'b`, as with most types. -// -// I am purposefully avoiding the terms co- and contra-variant because -// their application to regions depends on how you interpreted Rust -// regions. -nikomatsakis -struct Ordinary<'a>(&'a u8); - -// Here we need something outlived by `'a` *and* outlived by `'b`, but -// we can only name `'a` and `'b` (and neither suits). So we get an -// error. Somewhat unfortunate, though, since the caller would have to -// consider the loans for both `'a` and `'b` alive. - -fn upper_bounds<'a, 'b>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'a, 'b> -{ - // We return a value: - // - // ``` - // 'a: '0 - // 'b: '1 - // '0 in ['a, 'b] - // ``` - // - // but we don't have it. - // - // We are forced to pick that '0 = 'e, because only 'e is outlived by *both* 'a and 'b. - if condition() { a } else { b } - //~^ ERROR hidden type for `impl Trait<'a, 'b>` captures lifetime that does not appear in bounds -} - -fn condition() -> bool { - true -} - -fn main() {} |