Conversion between for_each and for-loop works worng for range expr

[ghost]

Related to #7741 and #7956

Conversion assists between for-loop and for_each are working well for normal iterable types, but it works wrong for range expr.

Example

• for-loop into for_each

// before
for _ in 0..10 {}

// after
0..10.for_each(|_| {}); // syntax error

• for_each into for-loop

// before
(0..v.len()).for_each(|_| {});

// after
for _ in (0..v.len()) {} // warning by unnecessary parentheses