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29 lines
925 B
Rust
29 lines
925 B
Rust
// See https://github.com/rust-lang/rust/issues/88442
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//@ run-rustfix
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//@ edition:2018
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//@ check-pass
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#![allow(unused)]
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#![warn(rust_2021_prelude_collisions)]
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trait AnnotatableTryInto {
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fn try_into<T>(self) -> Result<T, Self::Error>
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where Self: std::convert::TryInto<T> {
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std::convert::TryInto::try_into(self)
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}
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}
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impl<T> AnnotatableTryInto for T where T: From<u8> {}
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fn main() -> Result<(), &'static str> {
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let x: u64 = 1;
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x.try_into::<usize>().or(Err("foo"))?.checked_sub(1);
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//~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
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//~| WARNING this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
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x.try_into::<usize>().or(Err("foo"))?;
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//~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
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//~| WARNING this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
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Ok(())
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}
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