mirror of https://github.com/rust-lang/rust
30 lines
1.1 KiB
Rust
30 lines
1.1 KiB
Rust
// Checks for `if` expressions with respect to default match bindings.
|
|
// Specifically, we do not accept `if cond { ... }` where `cond: &mut? bool`.
|
|
// Meanwhile, `match cond { true => ..., _ => ... }` does accept that.
|
|
|
|
// FIXME(@rust-lang/lang-team): consider relaxing this?
|
|
|
|
fn b_ref<'a>() -> &'a bool { &true }
|
|
fn b_mut_ref<'a>() -> &'a mut bool { &mut true }
|
|
//~^ ERROR: cannot return reference to temporary
|
|
|
|
fn main() {
|
|
// This is OK:
|
|
match b_ref() { true => {}, _ => {} }
|
|
match b_mut_ref() { true => {}, _ => {} }
|
|
match &true { true => {}, _ => {} }
|
|
match &mut true { true => {}, _ => {} }
|
|
|
|
// This is NOT:
|
|
if b_ref() {} //~ ERROR mismatched types [E0308]
|
|
if b_mut_ref() {} //~ ERROR mismatched types [E0308]
|
|
if &true {} //~ ERROR mismatched types [E0308]
|
|
if &mut true {} //~ ERROR mismatched types [E0308]
|
|
|
|
// This is also NOT:
|
|
while b_ref() {} //~ ERROR mismatched types [E0308]
|
|
while b_mut_ref() {} //~ ERROR mismatched types [E0308]
|
|
while &true {} //~ ERROR mismatched types [E0308]
|
|
while &mut true {} //~ ERROR mismatched types [E0308]
|
|
}
|