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28 lines
609 B
Rust
28 lines
609 B
Rust
// This test shows the code that could have been accepted by enabling #![feature(if_let_rescope)]
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struct A;
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struct B<'a, T>(&'a mut T);
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impl A {
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fn f(&mut self) -> Option<B<'_, Self>> {
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Some(B(self))
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}
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}
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impl<'a, T> Drop for B<'a, T> {
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fn drop(&mut self) {
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// this is needed to keep NLL's hands off and to ensure
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// the inner mutable borrow stays alive
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}
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}
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fn main() {
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let mut a = A;
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if let None = a.f().as_ref() {
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unreachable!()
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} else {
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a.f().unwrap();
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//~^ ERROR cannot borrow `a` as mutable more than once at a time
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};
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}
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