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Regression test for incremental treatment of rustc_on_unimplemented.
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src/test/incremental/issue-59523-on-implemented-is-not-unused.rs
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// We should not see the unused_attributes lint fire for | ||
// rustc_on_unimplemented, but with this bug we are seeing it fire (on | ||
// subsequent runs) if incremental compilation is enabled. | ||
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// revisions: rpass1 rpass2 | ||
// compile-pass | ||
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#![feature(on_unimplemented)] | ||
#![deny(unused_attributes)] | ||
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#[rustc_on_unimplemented = "invalid"] | ||
trait Index<Idx: ?Sized> { | ||
type Output: ?Sized; | ||
fn index(&self, index: Idx) -> &Self::Output; | ||
} | ||
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#[rustc_on_unimplemented = "a usize is required to index into a slice"] | ||
impl Index<usize> for [i32] { | ||
type Output = i32; | ||
fn index(&self, index: usize) -> &i32 { | ||
&self[index] | ||
} | ||
} | ||
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fn main() { | ||
Index::<usize>::index(&[1, 2, 3] as &[i32], 2); | ||
} |