19 lines
425 B
Rust
19 lines
425 B
Rust
// revisions: ast mir
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//[mir]compile-flags: -Z borrowck=mir
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// Test that a by-ref `FnMut` closure gets an error when it tries to
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// mutate a value.
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fn call<F>(f: F) where F : Fn() {
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f();
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}
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fn main() {
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let mut counter = 0;
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call(|| {
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counter += 1;
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//[ast]~^ ERROR cannot assign to data in a captured outer variable in an `Fn` closure
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//[mir]~^^ ERROR cannot assign to `counter`
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});
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}
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