--- /dev/null
+// run-rustfix
+#![allow(dead_code, unused_must_use)]
+
+fn main() {}
+
+#[allow(clippy::unnecessary_operation)]
+fn starts_with() {
+ "".chars().next() == Some(' ');
+ Some(' ') != "".chars().next();
+}
+
+fn chars_cmp_with_unwrap() {
+ let s = String::from("foo");
+ if s.chars().next().unwrap() == 'f' {
+ // s.starts_with('f')
+ // Nothing here
+ }
+ if s.chars().next_back().unwrap() == 'o' {
+ // s.ends_with('o')
+ // Nothing here
+ }
+ if s.chars().last().unwrap() == 'o' {
+ // s.ends_with('o')
+ // Nothing here
+ }
+ if s.chars().next().unwrap() != 'f' {
+ // !s.starts_with('f')
+ // Nothing here
+ }
+ if s.chars().next_back().unwrap() != 'o' {
+ // !s.ends_with('o')
+ // Nothing here
+ }
+ if s.chars().last().unwrap() != 'o' {
+ // !s.ends_with('o')
+ // Nothing here
+ }
+}
+
+#[allow(clippy::unnecessary_operation)]
+fn ends_with() {
+ "".chars().last() == Some(' ');
+ Some(' ') != "".chars().last();
+ "".chars().next_back() == Some(' ');
+ Some(' ') != "".chars().next_back();
+}