bors 740668dbd9 Auto merge of #57428 - alexreg:associated_type_bounds, r=nikomatsakis,Centril
Implementation of RFC 2289 (associated_type_bounds)

This PR implements the [`asociated_type_bounds` feature](https://github.com/rust-lang/rfcs/blob/master/text/2289-associated-type-bounds.md).

Associated type bounds are implemented in:
   - function/method arguments and return types
   - structs, enums, unions
   - associated items in traits
   - type aliases
   - type parameter defaults
   - trait objects
   - let bindings

CC @nikomatsakis @centril
2019-06-06 03:56:22 +00:00
..
2019-02-10 23:42:32 +00:00