diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/issues/issue-12028.rs | |
parent | Initial commit. (diff) | |
download | rustc-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/issues/issue-12028.rs')
-rw-r--r-- | src/test/ui/issues/issue-12028.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-12028.rs b/src/test/ui/issues/issue-12028.rs new file mode 100644 index 000000000..7503766ff --- /dev/null +++ b/src/test/ui/issues/issue-12028.rs @@ -0,0 +1,38 @@ +// Test an example where we fail to infer the type parameter H. This +// is because there is really nothing constraining it. At one time, we +// would infer based on the where clauses in scope, but that no longer +// works. + +trait Hash<H> { + fn hash2(&self, hasher: &H) -> u64; +} + +trait Stream { + fn input(&mut self, bytes: &[u8]); + fn result(&self) -> u64; +} + +trait StreamHasher { + type S : Stream; + fn stream(&self) -> Self::S; +} + +trait StreamHash<H: StreamHasher>: Hash<H> { + fn input_stream(&self, stream: &mut H::S); +} + +impl<H: StreamHasher> Hash<H> for u8 { + fn hash2(&self, hasher: &H) -> u64 { + let mut stream = hasher.stream(); + self.input_stream(&mut stream); //~ ERROR type annotations needed + Stream::result(&stream) + } +} + +impl<H: StreamHasher> StreamHash<H> for u8 { + fn input_stream(&self, stream: &mut H::S) { + Stream::input(stream, &[*self]); + } +} + +fn main() {} |