1 files changed, 3 insertions, 1 deletions
diff --git a/lexer.h b/lexer.h
index c571294..c6576d0 100644
--- a/lexer.h
+++ b/lexer.h
@@ -3,6 +3,8 @@
 #include "minicc.h"
 #include "bnf.h"
 
+namespace Lex {
+
 struct TreeNode {
  index_t parent{};
  std::vector<index_t> childs; // fill char by char
@@ -53,4 +55,4 @@ public:
 
 };
 
-
+} // namespace Lex