error[E0308]: mismatched types --> $DIR/issue-53348.rs:10:13 | LL | let mut a = String::new(); | ------------- expected due to this value LL | for i in v { LL | a = *i.to_string(); | ^^^^^^^^^^^^^^ expected `String`, found `str` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.