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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs')
-rw-r--r-- | tests/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs b/tests/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs new file mode 100644 index 000000000..afab9986c --- /dev/null +++ b/tests/ui/higher-rank-trait-bounds/hrtb-fn-like-trait.rs @@ -0,0 +1,27 @@ +// run-pass +// A basic test of using a higher-ranked trait bound. + + +trait FnLike<A,R> { + fn call(&self, arg: A) -> R; +} + +struct Identity; + +impl<'a, T> FnLike<&'a T, &'a T> for Identity { + fn call(&self, arg: &'a T) -> &'a T { + arg + } +} + +fn call_repeatedly<F>(f: F) + where F : for<'a> FnLike<&'a isize, &'a isize> +{ + let x = 3; + let y = f.call(&x); + assert_eq!(3, *y); +} + +fn main() { + call_repeatedly(Identity); +} |