50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#![allow(unused)]
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#![deny(clippy, clippy_pedantic)]
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use std::ops::Mul;
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struct T;
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impl T {
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fn add(self, other: T) -> T { self } //~ERROR defining a method called `add`
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fn drop(&mut self) { } //~ERROR defining a method called `drop`
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fn sub(&self, other: T) -> &T { self } // no error, self is a ref
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fn div(self) -> T { self } // no error, different #arguments
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fn rem(self, other: T) { } // no error, wrong return type
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fn into_u32(self) -> u32 { 0 } // fine
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fn into_u16(&self) -> u16 { 0 } //~ERROR methods called `into_*` usually take self by value
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fn to_something(self) -> u32 { 0 } //~ERROR methods called `to_*` usually take self by reference
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}
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#[derive(Clone,Copy)]
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struct U;
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impl U {
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fn to_something(self) -> u32 { 0 } // ok because U is Copy
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}
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impl Mul<T> for T {
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type Output = T;
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fn mul(self, other: T) -> T { self } // no error, obviously
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}
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fn main() {
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let opt = Some(0);
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let _ = opt.unwrap(); //~ERROR used unwrap() on an Option
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let res: Result<i32, ()> = Ok(0);
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let _ = res.unwrap(); //~ERROR used unwrap() on a Result
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let _ = "str".to_string(); //~ERROR `"str".to_owned()` is faster
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let v = &"str";
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let string = v.to_string(); //~ERROR `(*v).to_owned()` is faster
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let _again = string.to_string(); //~ERROR `String.to_string()` is a no-op
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}
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