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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
commit698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch)
tree173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unrelated.rs
parentInitial commit. (diff)
downloadrustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz
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Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-unrelated.rs')
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+// 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 get an error because none of our choices (either `'d` nor `'e`) are outlived
+// by both `'a` and `'b`.
+
+fn upper_bounds<'a, 'b, 'c, 'd, 'e>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'d, 'e>
+where
+ 'a: 'e,
+ 'b: 'd,
+{
+ // Hidden type `Ordinary<'0>` with constraints:
+ //
+ // ```
+ // 'a: '0
+ // 'b: '0
+ // 'a in ['d, 'e]
+ // ```
+ if condition() { a } else { b }
+ //~^ ERROR hidden type for `impl Trait<'d, 'e>` captures lifetime that does not appear in bounds
+}
+
+fn condition() -> bool {
+ true
+}
+
+fn main() {}