bfbb1f5ce1
Implements RFC 1937: `?` in `main` This is the first part of the RFC 1937 that supports new `Termination` trait in the rust `main` function. Thanks @nikomatsakis, @arielb1 and all other people in the gitter channel for all your help! The support for doctest and `#[test]` is still missing, bu as @nikomatsakis said, smaller pull requests are better :)