30 lines
648 B
Rust
30 lines
648 B
Rust
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// Regression test for #125325
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// Tests that we suggest changing an `impl Fn` param
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// to `impl FnMut` when the provided closure arg
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// is trying to mutate the closure env.
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// Ensures that it works that way for both
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// functions and methods
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struct S;
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impl S {
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fn assoc_func(&self, _f: impl Fn()) -> usize {
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0
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}
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}
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fn func(_f: impl Fn()) -> usize {
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0
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}
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fn test_func(s: &S) -> usize {
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let mut x = ();
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s.assoc_func(|| x = ());
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//~^ cannot assign to `x`, as it is a captured variable in a `Fn` closure
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func(|| x = ())
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//~^ cannot assign to `x`, as it is a captured variable in a `Fn` closure
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}
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fn main() {}
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