Rustdoc renders type alias in a wrong way

[killercup]

'Complex' type aliases get rendered incorrectly by Rustdoc.

E.g., diesel::expression::helper_types::AsExprOf is defined here as:

pub type AsExprOf<Item, Type> = <Item as AsExpression<Type>>::Expression;

Rustdoc (from Rust 1.16 stable, rendered on Travis), however renders it like this (can be seen here):

type AsExprOf<Item, Type> = Item::Expression;

[GuillaumeGomez]

Once the current rustdoc switch is done, I'll try to work on this one.

[GuillaumeGomez]

Switch is now done. Taking a look.