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closures
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closure-immutable-outer-variable.rs
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//@ run-rustfix
// Point at the captured immutable outer variable
fn
foo
(
mut
f
:
Box
<
dyn
FnMut
()>)
{
f
();
}
fn
main
()
{
let
y
=
true
;
foo
(
Box
::
new
(
move
||
y
=
!
y
)
as
Box
<
_
>);
//~^ ERROR cannot assign to `y`, as it is not declared as mutable
}