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// Test that we are able to infer a suitable kind for this closure
// that is just called (`FnMut`).
fn main() {
let mut counter = 0;
// Here this must be inferred to FnMut so that it can mutate counter,
// but we forgot the mut.
let tick1 = || {
counter += 1;
};
// In turn, tick2 must be inferred to FnMut so that it can call
// tick1, but we forgot the mut.
let tick2 = || {
tick1(); //~ ERROR cannot borrow `tick1` as mutable
};
tick2(); //~ ERROR cannot borrow
}
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