anchor.diff:  ----
   util = library "utility" {
       source = {
  -        'common.c',
  -        'main.c',
  +        'util.c',
  +        'helper.c',
       },
       includes = common
   }
  
positive.code: 
  == Build Tree Structure
  
  All Moss build object files and products are placed in a Moss build tree
  structure called `moss.build` by default.
  
  Build objects and products are placed according to the following guidelines:
  
  - headers -> `M.HEADER.PATH`
  - static and shared libraries -> `M.LIBRARY.PATH`
  
negative.code: [source,lua]
  ----
  util = library "utility" {
      source = [[ util.c helper.c ]],
      includes = common
  }
  ----
  