error: calling `push_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:14:5
   |
LL |     string.push_str("R");
   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('R')`
   |
   = note: `-D clippy::single-char-add-str` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::single_char_add_str)]`

error: calling `push_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:15:5
   |
LL |     string.push_str("'");
   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('\'')`

error: calling `push_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:20:5
   |
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
  --> tests/ui/single_char_add_str.rs:21:5
   |
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
  --> tests/ui/single_char_add_str.rs:22:5
   |
LL |     string.push_str(r##"a"##);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('a')`

error: calling `push_str()` using a single-character converted to string
  --> tests/ui/single_char_add_str.rs:25:5
   |
LL |     string.push_str(&c_ref.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` without `to_string()`: `string.push(*c_ref)`

error: calling `push_str()` using a single-character converted to string
  --> tests/ui/single_char_add_str.rs:27:5
   |
LL |     string.push_str(&c.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` without `to_string()`: `string.push(c)`

error: calling `push_str()` using a single-character converted to string
  --> tests/ui/single_char_add_str.rs:28:5
   |
LL |     string.push_str(&'a'.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` without `to_string()`: `string.push('a')`

error: calling `push_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:30:5
   |
LL |     get_string!().push_str("ö");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `get_string!().push('ö')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:35:5
   |
LL |     string.insert_str(0, "R");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(0, 'R')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:36:5
   |
LL |     string.insert_str(1, "'");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(1, '\'')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:41:5
   |
LL |     string.insert_str(0, "\x52");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(0, '\x52')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:42:5
   |
LL |     string.insert_str(0, "\u{0052}");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(0, '\u{0052}')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:44:5
   |
LL |     string.insert_str(x, r##"a"##);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(x, 'a')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:46:5
   |
LL |     string.insert_str(Y, r##"a"##);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(Y, 'a')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:47:5
   |
LL |     string.insert_str(Y, r##"""##);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(Y, '"')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:48:5
   |
LL |     string.insert_str(Y, r##"'"##);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(Y, '\'')`

error: calling `insert_str()` using a single-character converted to string
  --> tests/ui/single_char_add_str.rs:50:5
   |
LL |     string.insert_str(0, &c_ref.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` without `to_string()`: `string.insert(0, *c_ref)`

error: calling `insert_str()` using a single-character converted to string
  --> tests/ui/single_char_add_str.rs:51:5
   |
LL |     string.insert_str(0, &c.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` without `to_string()`: `string.insert(0, c)`

error: calling `insert_str()` using a single-character converted to string
  --> tests/ui/single_char_add_str.rs:52:5
   |
LL |     string.insert_str(0, &'a'.to_string());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` without `to_string()`: `string.insert(0, 'a')`

error: calling `insert_str()` using a single-character string literal
  --> tests/ui/single_char_add_str.rs:54:5
   |
LL |     get_string!().insert_str(1, "?");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `get_string!().insert(1, '?')`

error: aborting due to 21 previous errors