44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
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//@aux-build:proc_macros.rs
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//@no-rustfix
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#![warn(clippy::unnecessary_fallible_conversions)]
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extern crate proc_macros;
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struct Foo;
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impl TryFrom<i32> for Foo {
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type Error = ();
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fn try_from(_: i32) -> Result<Self, Self::Error> {
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Ok(Foo)
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}
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}
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impl From<i64> for Foo {
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fn from(_: i64) -> Self {
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Foo
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}
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}
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fn main() {
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// `Foo` only implements `TryFrom<i32>` and not `From<i32>`, so don't lint
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let _: Result<Foo, _> = 0i32.try_into();
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let _: Result<Foo, _> = i32::try_into(0i32);
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let _: Result<Foo, _> = Foo::try_from(0i32);
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// ... it does impl From<i64> however
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let _: Result<Foo, _> = 0i64.try_into();
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//~^ ERROR: use of a fallible conversion when an infallible one could be used
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let _: Result<Foo, _> = i64::try_into(0i64);
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//~^ ERROR: use of a fallible conversion when an infallible one could be used
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let _: Result<Foo, _> = Foo::try_from(0i64);
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//~^ ERROR: use of a fallible conversion when an infallible one could be used
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let _: Result<i64, _> = 0i32.try_into();
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//~^ ERROR: use of a fallible conversion when an infallible one could be used
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let _: Result<i64, _> = i32::try_into(0i32);
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//~^ ERROR: use of a fallible conversion when an infallible one could be used
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let _: Result<i64, _> = <_>::try_from(0i32);
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//~^ ERROR: use of a fallible conversion when an infallible one could be used
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// From a macro
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let _: Result<i64, _> = proc_macros::external!(0i32).try_into();
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}
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