Now that features must be declared expanded source often does not compile. This adds 'pretty-expanded' to a bunch of test cases that still work.
Implements remaining part of RFC #47. Addresses issue #16461. Removed link_attrs from rust.md, they don't appear to be supported by the parser. Changed all the tests to use the new extern crate syntax Change pretty printer to use 'as' syntax
This was just a typo in the decoder using the source crate's number rather than the destination crate's number of a reexport. Closes #13872
