error[E0277]: the type `str` cannot be indexed by `{integer}`
  --> $DIR/str-idx.rs:3:17
   |
LL |     let _: u8 = s[4];
   |                 ^^^^ 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>
   = note: required because of the requirements on the impl of `std::ops::Index<{integer}>` for `str`

error[E0277]: the type `str` cannot be indexed by `{integer}`
  --> $DIR/str-idx.rs:4:15
   |
LL |     let _ = s.get(4);
   |               ^^^ 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-idx.rs:5:15
   |
LL |     let _ = s.get_unchecked(4);
   |               ^^^^^^^^^^^^^ 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-idx.rs:6:17
   |
LL |     let _: u8 = 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 4 previous errors

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