mirror of https://github.com/rust-lang/rust
99 lines
2.8 KiB
Rust
99 lines
2.8 KiB
Rust
//@ run-rustfix
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//@ edition:2018
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//@ check-pass
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#![warn(rust_2021_prelude_collisions)]
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trait TryIntoU32 {
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fn try_into(self) -> Result<u32, ()>;
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}
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impl TryIntoU32 for u8 {
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fn try_into(self) -> Result<u32, ()> {
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Ok(self as u32)
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}
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}
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// needed for autoref test
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impl TryIntoU32 for &f32 {
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fn try_into(self) -> Result<u32, ()> {
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Ok(*self as u32)
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}
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}
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trait TryFromU8: Sized {
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fn try_from(x: u8) -> Result<Self, ()>;
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}
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impl TryFromU8 for u32 {
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fn try_from(x: u8) -> Result<Self, ()> {
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Ok(x as u32)
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}
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}
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impl TryIntoU32 for *const u16 {
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fn try_into(self) -> Result<u32, ()> {
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Ok(unsafe { *self } as u32)
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}
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}
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trait FromByteIterator {
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fn from_iter<T>(iter: T) -> Self
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where
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T: Iterator<Item = u8>;
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}
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impl FromByteIterator for Vec<u8> {
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fn from_iter<T>(iter: T) -> Self
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where
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T: Iterator<Item = u8>,
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{
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iter.collect()
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}
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}
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fn main() {
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// test dot-call that will break in 2021 edition
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let _: u32 = 3u8.try_into().unwrap();
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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
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// test associated function call that will break in 2021 edition
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let _ = u32::try_from(3u8).unwrap();
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//~^ WARNING trait-associated function `try_from` will become ambiguous in Rust 2021
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//~^^ WARNING this is accepted in the current edition
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// test reverse turbofish too
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let _ = <Vec<u8>>::from_iter(vec![1u8, 2, 3, 4, 5, 6].into_iter());
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//~^ WARNING trait-associated function `from_iter` will become ambiguous in Rust 2021
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//~^^ WARNING this is accepted in the current edition
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// negative testing lint (this line should *not* emit a warning)
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let _: u32 = TryFromU8::try_from(3u8).unwrap();
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// test type omission
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let _: u32 = <_>::try_from(3u8).unwrap();
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//~^ WARNING trait-associated function `try_from` will become ambiguous in Rust 2021
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//~^^ WARNING this is accepted in the current edition
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// test autoderef
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let _: u32 = (&3u8).try_into().unwrap();
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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
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// test autoref
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let _: u32 = 3.0.try_into().unwrap();
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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
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let mut data = 3u16;
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let mut_ptr = std::ptr::addr_of_mut!(data);
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let _: u32 = mut_ptr.try_into().unwrap();
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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
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type U32Alias = u32;
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let _ = U32Alias::try_from(3u8).unwrap();
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//~^ WARNING trait-associated function `try_from` will become ambiguous in Rust 2021
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//~^^ WARNING this is accepted in the current edition
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}
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