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unboxed-closures
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unboxed-closures-mutated-upvar-from-fn-closure.rs
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// Test that a by-ref `FnMut` closure gets an error when it tries to
// mutate a value.
fn
call
<
F
>(
f
:
F
)
where F
:
Fn
()
{
f
();
}
fn
main
()
{
let
mut
counter
=
0
;
call
(||
{
counter
+=
1
;
//~^ ERROR cannot assign to `counter`
});
}