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rust-clippy/tests/ui/match_expr_like_matches_macro.rs

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// run-rustfix
#![warn(clippy::match_like_matches_macro)]
#![allow(unreachable_patterns, dead_code)]
fn main() {
let x = Some(5);
// Lint
let _y = match x {
Some(0) => true,
_ => false,
};
// Lint
let _w = match x {
Some(_) => true,
_ => false,
};
// Turn into is_none
let _z = match x {
Some(_) => false,
None => true,
};
// Lint
let _zz = match x {
Some(r) if r == 0 => false,
_ => true,
};
// Lint
let _zzz = if let Some(5) = x { true } else { false };
// No lint
let _a = match x {
Some(_) => false,
_ => false,
};
// No lint
let _ab = match x {
Some(0) => false,
_ => true,
None => false,
};
enum E {
A(u32),
B(i32),
C,
D,
}
let x = E::A(2);
{
// lint
let _ans = match x {
E::A(_) => true,
E::B(_) => true,
_ => false,
};
}
{
// lint
let _ans = match x {
E::B(_) => false,
E::C => false,
_ => true,
};
}
{
// no lint
let _ans = match x {
E::A(_) => false,
E::B(_) => false,
E::C => true,
_ => true,
};
}
{
// no lint
let _ans = match x {
E::A(_) => true,
E::B(_) => false,
E::C => false,
_ => true,
};
}
{
// no lint
let _ans = match x {
E::A(a) if a < 10 => false,
E::B(a) if a < 10 => false,
_ => true,
};
}
{
// no lint
let _ans = match x {
E::A(_) => false,
E::B(a) if a < 10 => false,
_ => true,
};
}
{
// no lint
let _ans = match x {
E::A(a) => a == 10,
E::B(_) => false,
_ => true,
};
}
{
// no lint
let _ans = match x {
E::A(_) => false,
E::B(_) => true,
_ => false,
};
}
{
// should print "z" in suggestion (#6503)
let z = &Some(3);
let _z = match &z {
Some(3) => true,
_ => false,
};
}
{
// this could also print "z" in suggestion..?
let z = Some(3);
let _z = match &z {
Some(3) => true,
_ => false,
};
}
{
enum AnEnum {
X,
Y,
}
fn foo(_x: AnEnum) {}
fn main() {
let z = AnEnum::X;
// we can't remove the reference here!
let _ = match &z {
AnEnum::X => true,
_ => false,
};
foo(z);
}
}
{
struct S(i32);
fn fun(_val: Option<S>) {}
let val = Some(S(42));
// we need the reference here because later val is consumed by fun()
let _res = match &val {
&Some(ref _a) => true,
_ => false,
};
fun(val);
}
{
struct S(i32);
fn fun(_val: Option<S>) {}
let val = Some(S(42));
let _res = match &val {
&Some(ref _a) => true,
_ => false,
};
fun(val);
}
}