mirror of https://github.com/rust-lang/rust
24 lines
427 B
Rust
24 lines
427 B
Rust
struct QualifiedError<E>(E);
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impl<E, T> From<E> for QualifiedError<T>
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where
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E: std::error::Error,
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T: From<E>,
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{
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fn from(e: E) -> QualifiedError<T> {
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QualifiedError(e.into())
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}
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}
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fn infallible() -> Result<(), std::convert::Infallible> {
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Ok(())
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}
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fn main() {
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let x = || -> Result<_, QualifiedError<_>> {
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infallible()?;
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Ok(())
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//~^ ERROR type annotations needed
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};
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}
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