443e4556c2
In accordance with the latter lint, replace map().unwrap_or_else() in src/mut_mut.rs with map_or_else()
123 lines
4 KiB
Rust
123 lines
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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/// Utility macro to test linting behavior in `option_methods()`
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/// The lints included in `option_methods()` should not lint if the call to map is partially
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/// within a macro
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macro_rules! opt_map {
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($opt:expr, $map:expr) => {($opt).map($map)};
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}
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/// Checks implementation of the following lints:
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/// OPTION_MAP_UNWRAP_OR
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/// OPTION_MAP_UNWRAP_OR_ELSE
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fn option_methods() {
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let opt = Some(1);
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// Check OPTION_MAP_UNWRAP_OR
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// single line case
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let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or(a)`
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//~| NOTE replace this
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.unwrap_or(0); // should lint even though this call is on a separate line
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// multi line cases
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let _ = opt.map(|x| { //~ ERROR called `map(f).unwrap_or(a)`
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x + 1
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}
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).unwrap_or(0);
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let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or(a)`
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.unwrap_or({
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0
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});
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// macro case
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let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
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// Check OPTION_MAP_UNWRAP_OR_ELSE
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// single line case
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let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or_else(g)`
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//~| NOTE replace this
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.unwrap_or_else(|| 0); // should lint even though this call is on a separate line
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// multi line cases
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let _ = opt.map(|x| { //~ ERROR called `map(f).unwrap_or_else(g)`
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x + 1
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}
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).unwrap_or_else(|| 0);
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let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or_else(g)`
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.unwrap_or_else(||
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0
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);
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// macro case
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let _ = opt_map!(opt, |x| x + 1).unwrap_or_else(|| 0); // should not lint
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}
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fn main() {
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use std::io;
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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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res.ok().expect("disaster!"); //~ERROR called `ok().expect()`
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// the following should not warn, since `expect` isn't implemented unless
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// the error type implements `Debug`
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let res2: Result<i32, MyError> = Ok(0);
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res2.ok().expect("oh noes!");
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// we currently don't warn if the error type has a type parameter
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// (but it would be nice if we did)
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let res3: Result<u32, MyErrorWithParam<u8>>= Ok(0);
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res3.ok().expect("whoof");
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let res4: Result<u32, io::Error> = Ok(0);
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res4.ok().expect("argh"); //~ERROR called `ok().expect()`
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let res5: io::Result<u32> = Ok(0);
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res5.ok().expect("oops"); //~ERROR called `ok().expect()`
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let res6: Result<u32, &str> = Ok(0);
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res6.ok().expect("meh"); //~ERROR called `ok().expect()`
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}
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struct MyError(()); // doesn't implement Debug
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#[derive(Debug)]
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struct MyErrorWithParam<T> {
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x: T
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}
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