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// aux-build: proc_macros.rs
#![warn(clippy::single_match_else)]
#![allow(clippy::needless_return, clippy::no_effect, clippy::uninlined_format_args)]
extern crate proc_macros;
use proc_macros::with_span;
enum ExprNode {
ExprAddrOf,
Butterflies,
Unicorns,
}
static NODE: ExprNode = ExprNode::Unicorns;
fn unwrap_addr() -> Option<&'static ExprNode> {
let _ = match ExprNode::Butterflies {
ExprNode::ExprAddrOf => Some(&NODE),
_ => {
let x = 5;
None
},
};
// Don't lint
with_span!(span match ExprNode::Butterflies {
ExprNode::ExprAddrOf => Some(&NODE),
_ => {
let x = 5;
None
},
})
}
macro_rules! unwrap_addr {
($expression:expr) => {
match $expression {
ExprNode::ExprAddrOf => Some(&NODE),
_ => {
let x = 5;
None
},
}
};
}
#[rustfmt::skip]
fn main() {
unwrap_addr!(ExprNode::Unicorns);
//
// don't lint single exprs/statements
//
// don't lint here
match Some(1) {
Some(a) => println!("${:?}", a),
None => return,
}
// don't lint here
match Some(1) {
Some(a) => println!("${:?}", a),
None => {
return
},
}
// don't lint here
match Some(1) {
Some(a) => println!("${:?}", a),
None => {
return;
},
}
//
// lint multiple exprs/statements "else" blocks
//
// lint here
match Some(1) {
Some(a) => println!("${:?}", a),
None => {
println!("else block");
return
},
}
// lint here
match Some(1) {
Some(a) => println!("${:?}", a),
None => {
println!("else block");
return;
},
}
// lint here
use std::convert::Infallible;
match Result::<i32, Infallible>::Ok(1) {
Ok(a) => println!("${:?}", a),
Err(_) => {
println!("else block");
return;
}
}
use std::borrow::Cow;
match Cow::from("moo") {
Cow::Owned(a) => println!("${:?}", a),
Cow::Borrowed(_) => {
println!("else block");
return;
}
}
}
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