error[E0308]: mismatched types --> $DIR/closure-no-fn-5.rs:10:27 | LL | let bar: fn() -> u8 = || { a; b; c; d; e }; | ---------- ^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found closure | | | expected due to this | = note: expected fn pointer `fn() -> u8` found closure `[closure@$DIR/closure-no-fn-5.rs:10:27: 10:29]` note: closures can only be coerced to `fn` types if they do not capture any variables --> $DIR/closure-no-fn-5.rs:10:32 | LL | let bar: fn() -> u8 = || { a; b; c; d; e }; | ^ ^ ^ ^ `d` captured here | | | | | | | `c` captured here | | `b` captured here | `a` captured here error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.