error: calling `push_str()` using a single-character string literal
  --> $DIR/single_char_push_str.rs:6:5
   |
LL |     string.push_str("R");
   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('R')`
   |
   = note: `-D clippy::single-char-push-str` implied by `-D warnings`

error: calling `push_str()` using a single-character string literal
  --> $DIR/single_char_push_str.rs:7:5
   |
LL |     string.push_str("'");
   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('/'')`

error: calling `push_str()` using a single-character string literal
  --> $DIR/single_char_push_str.rs:12:5
   |
LL |     string.push_str("/x52");
   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('/x52')`

error: calling `push_str()` using a single-character string literal
  --> $DIR/single_char_push_str.rs:13:5
   |
LL |     string.push_str("/u{0052}");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('/u{0052}')`

error: calling `push_str()` using a single-character string literal
  --> $DIR/single_char_push_str.rs:14:5
   |
LL |     string.push_str(r##"a"##);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('a')`

error: aborting due to 5 previous errors