Merge #7956

7956: Add assist to convert for_each into for loops r=Veykril a=SaiintBrisson

This PR resolves #7821.
Adds an assist to that converts an `Iterator::for_each` into a for loop: 

```rust
fn main() {
    let vec = vec![(1, 2), (2, 3), (3, 4)];
    x.iter().for_each(|(x, y)| {
        println!("x: {}, y: {}", x, y);
    })
}
```
becomes
```rust
fn main() {
    let vec = vec![(1, 2), (2, 3), (3, 4)];
    for (x, y) in x.iter() {
        println!("x: {}, y: {}", x, y);
    });
}
```

Co-authored-by: Luiz Carlos Mourão Paes de Carvalho <[email protected]>
Co-authored-by: Luiz Carlos <[email protected]>
Co-authored-by: Lukas Wirth <[email protected]>

1 files changed, 30 insertions, 0 deletions

diff --git a/crates/ide_assists/src/tests/generated.rs b/crates/ide_assists/src/tests/generated.rs
index 304b5798f..3f77edd8d 100644
--- a/crates/ide_assists/src/tests/generated.rs
+++ b/crates/ide_assists/src/tests/generated.rs
@@ -206,6 +206,36 @@ const _: i32 = 0b1010;
 }
 
 #[test]
+fn doctest_convert_iter_for_each_to_for() {
+    check_doc_test(
+        "convert_iter_for_each_to_for",
+        r#####"
+//- /lib.rs crate:core
+pub mod iter { pub mod traits { pub mod iterator { pub trait Iterator {} } } }
+pub struct SomeIter;
+impl self::iter::traits::iterator::Iterator for SomeIter {}
+//- /lib.rs crate:main deps:core
+use core::SomeIter;
+fn main() {
+    let iter = SomeIter;
+    iter.for_each$0(|(x, y)| {
+        println!("x: {}, y: {}", x, y);
+    });
+}
+"#####,
+        r#####"
+use core::SomeIter;
+fn main() {
+    let iter = SomeIter;
+    for (x, y) in iter {
+        println!("x: {}, y: {}", x, y);
+    }
+}
+"#####,
+    )
+}
+
+#[test]
 fn doctest_convert_to_guarded_return() {
     check_doc_test(
         "convert_to_guarded_return",