Commits on Apr 16, 2014

1. syntax: unify all MacResult's into a single trait. …

   There's now one unified way to return things from a macro, instead of
   being able to choose the `AnyMacro` trait or the `MRItem`/`MRExpr`
   variants of the `MacResult` enum. This does simplify the logic handling
   the expansions, but the biggest value of this is it makes macros in (for
   example) type position easier to implement, as there's this single thing
   to modify.
   
   By my measurements (using `-Z time-passes` on libstd and librustc etc.),
   this appears to have little-to-no impact on expansion speed. There are
   presumably larger costs than the small number of extra allocations and
   virtual calls this adds (notably, all `macro_rules!`-defined macros have
   not changed in behaviour, since they had to use the `AnyMacro` trait
   anyway).

   

   huonw committed Apr 16, 2014
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