error[E0308]: mismatched types --> $DIR/for-loop-bad-item.rs:7:19 | LL | for ((_, _), (&mut c, _)) in &mut map { | ^^^^^^ -------- this is an iterator with items of type `(&(char, char), &mut (char, char))` | | | expected `char`, found `&mut _` | = note: expected type `char` found mutable reference `&mut _` note: to declare a mutable binding use: `mut c` --> $DIR/for-loop-bad-item.rs:7:19 | LL | for ((_, _), (&mut c, _)) in &mut map { | ^^^^^^ help: consider removing `&mut` from the pattern | LL - for ((_, _), (&mut c, _)) in &mut map { LL + for ((_, _), (c, _)) in &mut map { | error[E0308]: mismatched types --> $DIR/for-loop-bad-item.rs:14:14 | LL | for Some(Qux(_)) | None in [Some(""), None] { | ^^^^^^ ---------------- this is an iterator with items of type `Option<&str>` | | | expected `str`, found `Qux` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.