error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/str-mut-idx.rs:4:15 | LL | s[1..2] = bot(); | ^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` note: required by a bound in `bot` --> $DIR/str-mut-idx.rs:1:8 | LL | fn bot() -> T { loop {} } | ^ required by this bound in `bot` help: consider relaxing the implicit `Sized` restriction | LL | fn bot() -> T { loop {} } | ++++++++ error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/str-mut-idx.rs:4:5 | LL | s[1..2] = bot(); | ^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` = note: the left-hand-side of an assignment must have a statically known size error[E0277]: the type `str` cannot be indexed by `usize` --> $DIR/str-mut-idx.rs:7:7 | LL | s[1usize] = bot(); | ^^^^^^ string indices are ranges of `usize` | = help: the trait `SliceIndex` is not implemented for `usize` = help: the trait `SliceIndex<[_]>` is implemented for `usize` = help: for that trait implementation, expected `[_]`, found `str` = note: required for `str` to implement `Index` error[E0277]: the type `str` cannot be indexed by `{integer}` --> $DIR/str-mut-idx.rs:9:15 | LL | s.get_mut(1); | ------- ^ string indices are ranges of `usize` | | | required by a bound introduced by this call | = help: the trait `SliceIndex` is not implemented for `{integer}` = note: you can use `.chars().nth()` or `.bytes().nth()` for more information, see chapter 8 in The Book: = help: the trait `SliceIndex<[_]>` is implemented for `usize` = help: for that trait implementation, expected `[_]`, found `str` note: required by a bound in `core::str::::get_mut` --> $SRC_DIR/core/src/str/mod.rs:LL:COL error[E0277]: the type `str` cannot be indexed by `{integer}` --> $DIR/str-mut-idx.rs:11:25 | LL | s.get_unchecked_mut(1); | ----------------- ^ string indices are ranges of `usize` | | | required by a bound introduced by this call | = help: the trait `SliceIndex` is not implemented for `{integer}` = note: you can use `.chars().nth()` or `.bytes().nth()` for more information, see chapter 8 in The Book: = help: the trait `SliceIndex<[_]>` is implemented for `usize` = help: for that trait implementation, expected `[_]`, found `str` note: required by a bound in `core::str::::get_unchecked_mut` --> $SRC_DIR/core/src/str/mod.rs:LL:COL error[E0277]: the type `str` cannot be indexed by `char` --> $DIR/str-mut-idx.rs:13:7 | LL | s['c']; | ^^^ string indices are ranges of `usize` | = help: the trait `SliceIndex` is not implemented for `char` = note: required for `str` to implement `Index` error: aborting due to 6 previous errors For more information about this error, try `rustc --explain E0277`.