Commits on Aug 1, 2013

1. Remove the pipes compiler …

   The pipes compiler produced data types that encoded efficient and safe
   bounded message passing protocols between two endpoints. It was also
   capable of producing unbounded protocols.
   
   It was useful research but was arguably done before its proper time.
   
   I am removing it for the following reasons:
   
   * In practice we used it only for producing the `oneshot` and `stream`
     unbounded protocols and all communication in Rust use those.
   * The interface between the proto! macro and the standard library
     has a large surface area and was difficult to maintain through
     language and library changes.
   * It is now written in an old dialect of Rust and generates code
     which would likely be considered non-idiomatic.
   * Both the compiler and the runtime are difficult to understand,
     and likewise the relationship between the generated code and
     the library is hard to understand. Debugging is difficult.
   * The new scheduler implements `stream` and `oneshot` by hand
     in a way that will be significantly easier to maintain.
   
   This shouldn't be taken as an indication that 'channel protocols'
   for Rust are not worth pursuing again in the future.

   

   brson committed Aug 1, 2013
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