mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-14 09:36:06 +00:00
44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
|
//@aux-build:proc_macros.rs
|
||
|
//@no-rustfix
|
||
|
#![warn(clippy::unnecessary_fallible_conversions)]
|
||
|
|
||
|
extern crate proc_macros;
|
||
|
|
||
|
struct Foo;
|
||
|
impl TryFrom<i32> for Foo {
|
||
|
type Error = ();
|
||
|
fn try_from(_: i32) -> Result<Self, Self::Error> {
|
||
|
Ok(Foo)
|
||
|
}
|
||
|
}
|
||
|
impl From<i64> for Foo {
|
||
|
fn from(_: i64) -> Self {
|
||
|
Foo
|
||
|
}
|
||
|
}
|
||
|
|
||
|
fn main() {
|
||
|
// `Foo` only implements `TryFrom<i32>` and not `From<i32>`, so don't lint
|
||
|
let _: Result<Foo, _> = 0i32.try_into();
|
||
|
let _: Result<Foo, _> = i32::try_into(0i32);
|
||
|
let _: Result<Foo, _> = Foo::try_from(0i32);
|
||
|
|
||
|
// ... it does impl From<i64> however
|
||
|
let _: Result<Foo, _> = 0i64.try_into();
|
||
|
//~^ ERROR: use of a fallible conversion when an infallible one could be used
|
||
|
let _: Result<Foo, _> = i64::try_into(0i64);
|
||
|
//~^ ERROR: use of a fallible conversion when an infallible one could be used
|
||
|
let _: Result<Foo, _> = Foo::try_from(0i64);
|
||
|
//~^ ERROR: use of a fallible conversion when an infallible one could be used
|
||
|
|
||
|
let _: Result<i64, _> = 0i32.try_into();
|
||
|
//~^ ERROR: use of a fallible conversion when an infallible one could be used
|
||
|
let _: Result<i64, _> = i32::try_into(0i32);
|
||
|
//~^ ERROR: use of a fallible conversion when an infallible one could be used
|
||
|
let _: Result<i64, _> = <_>::try_from(0i32);
|
||
|
//~^ ERROR: use of a fallible conversion when an infallible one could be used
|
||
|
|
||
|
// From a macro
|
||
|
let _: Result<i64, _> = proc_macros::external!(0i32).try_into();
|
||
|
}
|