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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/higher-rank-trait-bounds/hrtb-fn-like-trait-object.rs
parentInitial commit. (diff)
downloadrustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz
rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip
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/higher-rank-trait-bounds/hrtb-fn-like-trait-object.rs')
-rw-r--r--src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait-object.rs27
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diff --git a/src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait-object.rs b/src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait-object.rs
new file mode 100644
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+++ b/src/test/ui/higher-rank-trait-bounds/hrtb-fn-like-trait-object.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;
+}
+
+type FnObject<'b> = dyn for<'a> FnLike<&'a isize, &'a isize> + 'b;
+
+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: &FnObject) {
+ let x = 3;
+ let y = f.call(&x);
+ assert_eq!(3, *y);
+}
+
+fn main() {
+ call_repeatedly(&Identity);
+}