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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:29 +0000 |
commit | 631cd5845e8de329d0e227aaa707d7ea228b8f8f (patch) | |
tree | a1b87c8f8cad01cf18f7c5f57a08f102771ed303 /tests/ui/issue-15924.rs | |
parent | Adding debian version 1.69.0+dfsg1-1. (diff) | |
download | rustc-631cd5845e8de329d0e227aaa707d7ea228b8f8f.tar.xz rustc-631cd5845e8de329d0e227aaa707d7ea228b8f8f.zip |
Merging upstream version 1.70.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/issue-15924.rs')
-rw-r--r-- | tests/ui/issue-15924.rs | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/tests/ui/issue-15924.rs b/tests/ui/issue-15924.rs new file mode 100644 index 000000000..d8b3914d0 --- /dev/null +++ b/tests/ui/issue-15924.rs @@ -0,0 +1,53 @@ +// run-pass + +#![allow(unused_imports)] +#![allow(unused_must_use)] +// pretty-expanded FIXME #23616 + +use std::fmt; +use std::marker::PhantomData; + +trait Encoder { + type Error; +} + +trait Encodable<S: Encoder> { + fn encode(&self, s: &mut S) -> Result<(), S::Error>; +} + +impl<S: Encoder> Encodable<S> for i32 { + fn encode(&self, _s: &mut S) -> Result<(), S::Error> { + Ok(()) + } +} + +struct JsonEncoder<'a>(PhantomData<&'a mut ()>); + +impl Encoder for JsonEncoder<'_> { + type Error = (); +} + +fn encode_json<T: for<'r> Encodable<JsonEncoder<'r>>>( + object: &T, +) -> Result<String, ()> { + let s = String::new(); + { + let mut encoder = JsonEncoder(PhantomData); + object.encode(&mut encoder)?; + } + Ok(s) +} + +struct Foo<T: for<'a> Encodable<JsonEncoder<'a>>> { + v: T, +} + +impl<T: for<'a> Encodable<JsonEncoder<'a>>> Drop for Foo<T> { + fn drop(&mut self) { + encode_json(&self.v); + } +} + +fn main() { + let _ = Foo { v: 10 }; +} |