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