mirror of https://github.com/rust-lang/rust
50 lines
1.0 KiB
Rust
50 lines
1.0 KiB
Rust
// Regression test for #54779, checks if the diagnostics are confusing.
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trait DebugWith<Cx: ?Sized> {
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fn debug_with<'me>(&'me self, cx: &'me Cx) -> DebugCxPair<'me, Self, Cx> {
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DebugCxPair { value: self, cx }
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}
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fn fmt_with(&self, cx: &Cx, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result;
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}
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struct DebugCxPair<'me, Value: ?Sized, Cx: ?Sized>
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where
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Value: DebugWith<Cx>,
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{
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value: &'me Value,
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cx: &'me Cx,
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}
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trait DebugContext {}
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struct Foo {
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bar: Bar,
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}
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impl DebugWith<dyn DebugContext> for Foo {
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fn fmt_with(
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&self,
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cx: &dyn DebugContext,
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fmt: &mut std::fmt::Formatter<'_>,
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) -> std::fmt::Result {
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let Foo { bar } = self;
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bar.debug_with(cx); //~ ERROR: lifetime may not live long enough
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Ok(())
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}
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}
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struct Bar {}
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impl DebugWith<dyn DebugContext> for Bar {
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fn fmt_with(
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&self,
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cx: &dyn DebugContext,
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fmt: &mut std::fmt::Formatter<'_>,
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) -> std::fmt::Result {
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Ok(())
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}
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}
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fn main() {}
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