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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:06:31 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:06:31 +0000
commit2ff14448863ac1a1dd9533461708e29aae170c2d (patch)
tree85b9fea2bbfe3f06473cfa381eed11f273b57c5c /src/test/ui/generic-associated-types/bugs/issue-91762.rs
parentAdding debian version 1.64.0+dfsg1-1. (diff)
downloadrustc-2ff14448863ac1a1dd9533461708e29aae170c2d.tar.xz
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Adding debian version 1.65.0+dfsg1-2.debian/1.65.0+dfsg1-2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/generic-associated-types/bugs/issue-91762.rs')
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diff --git a/src/test/ui/generic-associated-types/bugs/issue-91762.rs b/src/test/ui/generic-associated-types/bugs/issue-91762.rs
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@@ -0,0 +1,29 @@
+// check-fail
+// known-bug
+
+// We almost certaintly want this to pass, but
+// it's particularly difficult currently, because we need a way of specifying
+// that `<Self::Base as Functor>::With<T> = Self` without using that when we have
+// a `U`. See `https://github.com/rust-lang/rust/pull/92728` for a (hacky)
+// solution. This might be better to just wait for Chalk.
+
+pub trait Functor {
+ type With<T>;
+
+ fn fmap<T, U>(this: Self::With<T>) -> Self::With<U>;
+}
+
+pub trait FunctorExt<T>: Sized {
+ type Base: Functor<With<T> = Self>;
+
+ fn fmap<U>(self) {
+ let arg: <Self::Base as Functor>::With<T>;
+ let ret: <Self::Base as Functor>::With<U>;
+
+ arg = self;
+ ret = <Self::Base as Functor>::fmap(arg);
+ //~^ type annotations needed
+ }
+}
+
+fn main() {}