test: add test cases for str

tests/ui/search_is_some_fixable_none.fixed

@@ -224,15 +224,42 @@ mod issue_11910 {
         fn bar(&self, _: bool) {}
     }
 
-    fn test_then() {
+    fn test_normal_for_iter() {
+        let v = vec![3, 2, 1, 0, -1, -2, -3];
+        let _ = !v.iter().any(|x| *x == 42);
+        Foo.bar(!v.iter().any(|x| *x == 42));
+    }
+
+    fn test_then_for_iter() {
         let v = vec![3, 2, 1, 0, -1, -2, -3];
         (!v.iter().any(|x| *x == 42)).then(computations);
     }
 
-    fn test_then_some() {
+    fn test_then_some_for_iter() {
         let v = vec![3, 2, 1, 0, -1, -2, -3];
         (!v.iter().any(|x| *x == 42)).then_some(0);
+    }
 
-        Foo.bar(!v.iter().any(|x| *x == 42));
+    fn test_normal_for_str() {
+        let s = "hello";
+        let _ = !s.contains("world");
+        Foo.bar(!s.contains("world"));
+        let s = String::from("hello");
+        let _ = !s.contains("world");
+        Foo.bar(!s.contains("world"));
+    }
+
+    fn test_then_for_str() {
+        let s = "hello";
+        let _ = (!s.contains("world")).then(computations);
+        let s = String::from("hello");
+        let _ = (!s.contains("world")).then(computations);
+    }
+
+    fn test_then_some_for_str() {
+        let s = "hello";
+        let _ = (!s.contains("world")).then_some(0);
+        let s = String::from("hello");
+        let _ = (!s.contains("world")).then_some(0);
     }
 }

tests/ui/search_is_some_fixable_none.rs

@@ -230,15 +230,42 @@ impl Foo {
         fn bar(&self, _: bool) {}
     }
 
-    fn test_then() {
+    fn test_normal_for_iter() {
+        let v = vec![3, 2, 1, 0, -1, -2, -3];
+        let _ = v.iter().find(|x| **x == 42).is_none();
+        Foo.bar(v.iter().find(|x| **x == 42).is_none());
+    }
+
+    fn test_then_for_iter() {
         let v = vec![3, 2, 1, 0, -1, -2, -3];
         v.iter().find(|x| **x == 42).is_none().then(computations);
     }
 
-    fn test_then_some() {
+    fn test_then_some_for_iter() {
         let v = vec![3, 2, 1, 0, -1, -2, -3];
         v.iter().find(|x| **x == 42).is_none().then_some(0);
+    }
 
-        Foo.bar(v.iter().find(|x| **x == 42).is_none());
+    fn test_normal_for_str() {
+        let s = "hello";
+        let _ = s.find("world").is_none();
+        Foo.bar(s.find("world").is_none());
+        let s = String::from("hello");
+        let _ = s.find("world").is_none();
+        Foo.bar(s.find("world").is_none());
+    }
+
+    fn test_then_for_str() {
+        let s = "hello";
+        let _ = s.find("world").is_none().then(computations);
+        let s = String::from("hello");
+        let _ = s.find("world").is_none().then(computations);
+    }
+
+    fn test_then_some_for_str() {
+        let s = "hello";
+        let _ = s.find("world").is_none().then_some(0);
+        let s = String::from("hello");
+        let _ = s.find("world").is_none().then_some(0);
     }
 }

tests/ui/search_is_some_fixable_none.stderr

@@ -283,22 +283,76 @@ LL |         let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_none();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!v.iter().any(|fp| test_u32_2(*fp.field))`
 
 error: called `is_none()` after searching an `Iterator` with `find`
-  --> $DIR/search_is_some_fixable_none.rs:235:9
+  --> $DIR/search_is_some_fixable_none.rs:235:17
+   |
+LL |         let _ = v.iter().find(|x| **x == 42).is_none();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!v.iter().any(|x| *x == 42)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+  --> $DIR/search_is_some_fixable_none.rs:236:17
+   |
+LL |         Foo.bar(v.iter().find(|x| **x == 42).is_none());
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!v.iter().any(|x| *x == 42)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+  --> $DIR/search_is_some_fixable_none.rs:241:9
    |
 LL |         v.iter().find(|x| **x == 42).is_none().then(computations);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(!v.iter().any(|x| *x == 42))`
 
 error: called `is_none()` after searching an `Iterator` with `find`
-  --> $DIR/search_is_some_fixable_none.rs:240:9
+  --> $DIR/search_is_some_fixable_none.rs:246:9
    |
 LL |         v.iter().find(|x| **x == 42).is_none().then_some(0);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(!v.iter().any(|x| *x == 42))`
 
-error: called `is_none()` after searching an `Iterator` with `find`
+error: called `is_none()` after calling `find()` on a string
-  --> $DIR/search_is_some_fixable_none.rs:242:17
+  --> $DIR/search_is_some_fixable_none.rs:251:17
    |
-LL |         Foo.bar(v.iter().find(|x| **x == 42).is_none());
+LL |         let _ = s.find("world").is_none();
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!v.iter().any(|x| *x == 42)`
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!s.contains("world")`
 
-error: aborting due to 46 previous errors
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:252:17
+   |
+LL |         Foo.bar(s.find("world").is_none());
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!s.contains("world")`
+
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:254:17
+   |
+LL |         let _ = s.find("world").is_none();
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!s.contains("world")`
+
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:255:17
+   |
+LL |         Foo.bar(s.find("world").is_none());
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `!s.contains("world")`
+
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:260:17
+   |
+LL |         let _ = s.find("world").is_none().then(computations);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(!s.contains("world"))`
+
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:262:17
+   |
+LL |         let _ = s.find("world").is_none().then(computations);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(!s.contains("world"))`
+
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:267:17
+   |
+LL |         let _ = s.find("world").is_none().then_some(0);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(!s.contains("world"))`
+
+error: called `is_none()` after calling `find()` on a string
+  --> $DIR/search_is_some_fixable_none.rs:269:17
+   |
+LL |         let _ = s.find("world").is_none().then_some(0);
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(!s.contains("world"))`
+
+error: aborting due to 55 previous errors