1error[E0594]: cannot assign to `n`, as it is not declared as mutable 2 --> $DIR/unboxed-closures-mutate-upvar.rs:15:9 3 | 4LL | let n = 0; 5 | - help: consider changing this to be mutable: `mut n` 6LL | let mut f = to_fn_mut(|| { 7LL | n += 1; 8 | ^^^^^^ cannot assign 9 10error[E0594]: cannot assign to `n`, as it is not declared as mutable 11 --> $DIR/unboxed-closures-mutate-upvar.rs:32:9 12 | 13LL | let n = 0; 14 | - help: consider changing this to be mutable: `mut n` 15... 16LL | n += 1; 17 | ^^^^^^ cannot assign 18 19error[E0594]: cannot assign to `n`, as it is not declared as mutable 20 --> $DIR/unboxed-closures-mutate-upvar.rs:46:9 21 | 22LL | let n = 0; 23 | - help: consider changing this to be mutable: `mut n` 24LL | let mut f = to_fn(move || { 25LL | n += 1; 26 | ^^^^^^ cannot assign 27 28error[E0594]: cannot assign to `n`, as it is a captured variable in a `Fn` closure 29 --> $DIR/unboxed-closures-mutate-upvar.rs:53:9 30 | 31LL | fn to_fn<A,F:Fn<A>>(f: F) -> F { f } 32 | - change this to accept `FnMut` instead of `Fn` 33... 34LL | let mut f = to_fn(move || { 35 | _________________-----_- 36 | | | 37 | | expects `Fn` instead of `FnMut` 38LL | | n += 1; 39 | | ^^^^^^ cannot assign 40LL | | }); 41 | |_____- in this closure 42 43error: aborting due to 4 previous errors 44 45For more information about this error, try `rustc --explain E0594`. 46