Pretty printing loses associated type generics and where clauses

[matthewjasper]

The following code:

#![feature(generic_associated_types)]

trait X {
    type Y<T>: i32 where Self: Sized;
}

impl X for () {
    type Y<T> where Self: Sized = u32;
}

is pretty printed as

#![feature(generic_associated_types)]

trait X {
    type
    Y: i32;
}

impl X for () {
    type
    Y
    =
    u32;
}

This presumably also affects procedural macros.

[basil-cow]

Are there tests intended for pretty printing? I got the impression that pretty folder only tests specific features and bugs, not the form