error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/str-mut-idx.rs:4:15
   |
LL | fn bot<T>() -> T { loop {} }
   |        - required by this bound in `bot`
...
LL |     s[1..2] = bot();
   |               ^^^ doesn't have a size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `str`
help: consider relaxing the implicit `Sized` restriction
   |
LL | fn bot<T: ?Sized>() -> 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 `std::marker::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:7:5
   |
LL |     s[1usize] = bot();
   |     ^^^^^^^^^ string indices are ranges of `usize`
   |
   = help: the trait `std::slice::SliceIndex<str>` is not implemented for `usize`
   = note: required because of the requirements on the impl of `std::ops::Index<usize>` for `str`

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`
   |
   = help: the trait `std::slice::SliceIndex<str>` is not implemented for `{integer}`
   = note: you can use `.chars().nth()` or `.bytes().nth()`
           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>

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`
   |
   = help: the trait `std::slice::SliceIndex<str>` is not implemented for `{integer}`
   = note: you can use `.chars().nth()` or `.bytes().nth()`
           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>

error[E0277]: the type `str` cannot be indexed by `char`
  --> $DIR/str-mut-idx.rs:13:5
   |
LL |     s['c'];
   |     ^^^^^^ string indices are ranges of `usize`
   |
   = help: the trait `std::slice::SliceIndex<str>` is not implemented for `char`
   = note: required because of the requirements on the impl of `std::ops::Index<char>` for `str`

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0277`.