rust/tests/compile-fail/matches.rs
Georg Brandl 7580da306e matches: special message for this case
match &e { &Pat1 => {}, &Pat2 => {}, ... }

(inspired by dogfood fixes)
2015-08-22 14:34:39 +02:00

66 lines
1.5 KiB
Rust
Executable File

#![feature(plugin)]
#![plugin(clippy)]
#![deny(clippy)]
#![allow(unused)]
fn single_match(){
let x = Some(1u8);
match x { //~ ERROR you seem to be trying to use match
//~^ HELP try
Some(y) => {
println!("{:?}", y);
}
_ => ()
}
// Not linted
match x {
Some(y) => println!("{:?}", y),
None => ()
}
let z = (1u8,1u8);
match z { //~ ERROR you seem to be trying to use match
//~^ HELP try
(2...3, 7...9) => println!("{:?}", z),
_ => {}
}
// Not linted (pattern guards used)
match x {
Some(y) if y == 0 => println!("{:?}", y),
_ => ()
}
// Not linted (content in the else)
match z {
(2...3, 7...9) => println!("{:?}", z),
_ => println!("nope"),
}
}
fn ref_pats() {
let ref v = Some(0);
match v { //~ERROR instead of prefixing all patterns with `&`
&Some(v) => println!("{:?}", v),
&None => println!("none"),
}
match v { // this doesn't trigger, we have a different pattern
&Some(v) => println!("some"),
other => println!("other"),
}
let ref tup = (1, 2);
match tup { //~ERROR instead of prefixing all patterns with `&`
&(v, 1) => println!("{}", v),
_ => println!("none"),
}
// special case: using & both in expr and pats
let w = Some(0);
match &w { //~ERROR you don't need to add `&` to both
&Some(v) => println!("{:?}", v),
&None => println!("none"),
}
}
fn main() {
}