anchor.diff:  === Syntax Extensions ===
   
   Tundra provides a small set of syntax extensions by default. To use syntax
  -extensions, add a SyntaxExtensions list to the `tundra.lua` file specifying the
  -extensions you want to enable. These are Lua package names.
  +extensions, simply `require` their Lua package names in your `units.lua` or
  +`tundra.lua` file. To add your own directories to the `require` search path,
  +refer to the `ScriptDirs` option.
   
   ==== File Globbing ====
   
  
positive.code: included.
  
  .Configuration Filtering Flattening
  -------------------------------------------------------------------------------
  { "foo.c",
      { "bar.c"; Config = "*-*-debug" },
  
negative.code: through the environment:
  
  .Bison/Flex Example
  [source,lua]
  -------------------------------------------------------------------------------
  ...
  Env = {
  