preprocessor: add #ifndef...#endif include guard optimization

1 files changed, 3 insertions, 0 deletions

diff --git a/c/lex.h b/c/lex.h
index cb25d8b..aab2762 100644
--- a/c/lex.h
+++ b/c/lex.h
@@ -99,6 +99,9 @@ struct lexer {
    struct token peektok;
    bool eof, err;
    struct arena **tmparena;
+   bool firstdirective;
+   ushort nppcnd0;
+   const char *inclguard;
 };
 
 enum initlexer {