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+nat-5.1.3
+
+This directory contains versions of front end files that are rewritten
+to be more "native" to Lua. These files should be considered as
+exercises in exploring ways to write the front end, for example, to
+write a front end that is optimized for size, etc. See also file size
+data further below.
+
+The following are the different versions available (mk2 == "mark 2",
+this is commonly used in the UK, e.g. for aeroplanes during WWII):
+
+Lexers
+------
+
+NOTE: These lexers should behave mostly identically to the original C
+lexer. Locale support for non-standard decimal points is missing. Also,
+all strings and long strings have line endings normalized to LF.
+
+llex_mk2        Rewritten from original ported code to become more
+                Lua-like. Needs input to be entered as a single string.
+                Unless an application's need is very unusual, this
+                should not be a problem. It will not work for per-line
+                interaction, though. This version is also somewhat
+                optimized for size; its stripped binary chunk size is
+                3716 bytes.
+
+                Status: TESTED
+
+Parsers
+-------
+
+lparser_mk2     Written for the simplified lexer interface of llex_mk2.
+                This is a lexer skeleton, stripped of codegen code. Has
+                a minimum of variable management code added, and tracks
+                the is_vararg flag of a function. See the comments in
+                the source code for more information. Without logging
+                messages and comments, it should be under 600 LOC. A
+                binary chunk of lparser_mk2 (stripped) is 15783 bytes.
+
+                Sample output of the parser message logger can be found
+                in the test/parser_log subdirectory.
+
+                Tested with test_parser-5.1.lua, the Lua 5.1.x parser test
+                cases in the test_lua/ directory, appears to be fine.
+
+                Compared to the 5.0.x parser skeleton, the main changes
+                are: (a) 'arg' not implemented, so it appears as a global,
+                and (b) '...' recognized as the last function parameter.
+
+                Status: SNIPPETS APPEAR TO WORK
+
+Other notes:
+------------
+
+None.