This is an example of output from the formatter now:
```
//// Some module documentation
// foo
const a: Int = 42
// Some comment block
// For which newlines are respected.
// Foo
// Another one
/// add_one documentation
pub fn add_one(n: Int) -> Int {
// n + 1
n + 1
}
```
before this commit, comments would all be collapsed into one group
above the function as:
```
// Some comment block
// For which newlines are respected.
// Foo
// Another one
/// add_one documentation
pub fn add_one(n: Int) -> Int {
```
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