build lexing mostly

- outline the whole of lexing (maybe)
- split it to separate C file
- add standin code to main

1 files changed, 5 insertions, 0 deletions

diff --git a/lex.h b/lex.h
index b777d95..b27c03e 100644
--- a/lex.h
+++ b/lex.h
@@ -1,3 +1,6 @@
+#ifndef LEX_H
+#define LEX_H
+
 #include "typeutils.h"
 
 
@@ -72,3 +75,5 @@ struct ExpansionRegion {
 DECLARE_MAYBE(Chunk);
 
 DECLARE_VEC(ExpansionRegion, ExpansionRegionVec)
+
+#endif