Commits on Apr 19, 2018

1. proc_macro: Stay on the "use the cache" path more …

   Discovered in rust-lang#50061 we're falling off the "happy path" of using a stringified
   token stream more often than we should. This was due to the fact that a
   user-written token like `0xf` is equality-different from the stringified token
   of `15` (despite being semantically equivalent).
   
   This patch updates the call to `eq_unspanned` with an even more awful solution,
   `probably_equal_for_proc_macro`, which ignores the value of each token and
   basically only compares the structure of the token stream, assuming that the AST
   doesn't change just one token at a time.
   
   While this is a step towards fixing rust-lang#50061 there is still one regression
   from rust-lang#49154 which needs to be fixed.

   

   alexcrichton committed Apr 19, 2018
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