error[E0308]: mismatched types
  --> $DIR/semi-suggestion-when-stmt-and-expr-span-equal.rs:13:5
   |
LL |   fn foo() -> String {
   |               ------ expected `String` because of return type
LL |       let mut list = {
   |  ____________________-
LL | |         println!();
LL | |     };
   | |_____- this block is missing a tail expression
LL |       list
   |       ^^^^ expected `String`, found `()`

error[E0277]: a value of type `String` cannot be built from an iterator over elements of type `()`
  --> $DIR/semi-suggestion-when-stmt-and-expr-span-equal.rs:23:20
   |
LL |         .collect::<String>();
   |          -------   ^^^^^^ value of type `String` cannot be built from `std::iter::Iterator<Item=()>`
   |          |
   |          required by a bound introduced by this call
   |
   = help: the trait `FromIterator<()>` is not implemented for `String`
   = help: the following other types implement trait `FromIterator<A>`:
             `String` implements `FromIterator<&char>`
             `String` implements `FromIterator<&str>`
             `String` implements `FromIterator<Box<str, A>>`
             `String` implements `FromIterator<Cow<'_, str>>`
             `String` implements `FromIterator<String>`
             `String` implements `FromIterator<char>`
note: the method call chain might not have had the expected associated types
  --> $DIR/semi-suggestion-when-stmt-and-expr-span-equal.rs:20:10
   |
LL |       String::new()
   |       ------------- this expression has type `String`
LL |           .chars()
   |            ------- `Iterator::Item` is `char` here
LL |           .filter(|x| !x.is_whitespace())
   |            ------------------------------ `Iterator::Item` remains `char` here
LL |           .map(|x| {
   |  __________^
LL | |             println!("Child spawned with the size: {}", x);
LL | |         })
   | |__________^ `Iterator::Item` changed to `()` here
note: required by a bound in `collect`
  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.