error: single-character string constant used as pattern
 --> $DIR/single_char_pattern.rs:5:13
  |
5 |     x.split("x");
  |     --------^^^- help: try using a char instead: `x.split('x')`
  |
  = note: `-D single-char-pattern` implied by `-D warnings`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:22:16
   |
22 |     x.contains("x");
   |     -----------^^^- help: try using a char instead: `x.contains('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:23:19
   |
23 |     x.starts_with("x");
   |     --------------^^^- help: try using a char instead: `x.starts_with('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:24:17
   |
24 |     x.ends_with("x");
   |     ------------^^^- help: try using a char instead: `x.ends_with('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:25:12
   |
25 |     x.find("x");
   |     -------^^^- help: try using a char instead: `x.find('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:26:13
   |
26 |     x.rfind("x");
   |     --------^^^- help: try using a char instead: `x.rfind('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:27:14
   |
27 |     x.rsplit("x");
   |     ---------^^^- help: try using a char instead: `x.rsplit('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:28:24
   |
28 |     x.split_terminator("x");
   |     -------------------^^^- help: try using a char instead: `x.split_terminator('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:29:25
   |
29 |     x.rsplit_terminator("x");
   |     --------------------^^^- help: try using a char instead: `x.rsplit_terminator('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:30:17
   |
30 |     x.splitn(0, "x");
   |     ------------^^^- help: try using a char instead: `x.splitn(0, 'x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:31:18
   |
31 |     x.rsplitn(0, "x");
   |     -------------^^^- help: try using a char instead: `x.rsplitn(0, 'x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:32:15
   |
32 |     x.matches("x");
   |     ----------^^^- help: try using a char instead: `x.matches('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:33:16
   |
33 |     x.rmatches("x");
   |     -----------^^^- help: try using a char instead: `x.rmatches('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:34:21
   |
34 |     x.match_indices("x");
   |     ----------------^^^- help: try using a char instead: `x.match_indices('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:35:22
   |
35 |     x.rmatch_indices("x");
   |     -----------------^^^- help: try using a char instead: `x.rmatch_indices('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:36:25
   |
36 |     x.trim_left_matches("x");
   |     --------------------^^^- help: try using a char instead: `x.trim_left_matches('x')`

error: single-character string constant used as pattern
  --> $DIR/single_char_pattern.rs:37:26
   |
37 |     x.trim_right_matches("x");
   |     ---------------------^^^- help: try using a char instead: `x.trim_right_matches('x')`

error: aborting due to 17 previous errors