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27 lines
562 B
Rust
27 lines
562 B
Rust
// Test that the `'a` in the where clause correctly links the region
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// of the output to the region of the input.
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trait FnLike<A,R> {
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fn call(&self, arg: A) -> R;
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}
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fn call_repeatedly<F>(f: F)
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where F : for<'a> FnLike<&'a isize, &'a isize>
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{
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// Result is stored: cannot re-assign `x`
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let mut x = 3;
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let y = f.call(&x);
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x = 5; //~ ERROR cannot assign to `x` because it is borrowed
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// Result is not stored: can re-assign `x`
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let mut x = 3;
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f.call(&x);
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f.call(&x);
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f.call(&x);
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x = 5;
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drop(y);
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}
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fn main() {
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}
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