diff --git a/version2.0/nasal_ast.h b/version2.0/nasal_ast.h
index 069c0a1..792a989 100644
--- a/version2.0/nasal_ast.h
+++ b/version2.0/nasal_ast.h
@@ -104,7 +104,7 @@ void abstract_syntax_tree::print_tree_block(const int n)
 {
 	std::string __str="";
 	for(int i=0;i<n;++i)
-		__str+="| ";
+		__str+="|  ";
 	std::cout<<__str;
 	print_ast_type(node_type);
 	switch(node_type)
@@ -752,4 +752,4 @@ ast:
 																id: i
 					return
 						num: 0
-*/
\ No newline at end of file
+*/
diff --git a/version2.0/nasal_lexer.h b/version2.0/nasal_lexer.h
index e300483..1261f23 100644
--- a/version2.0/nasal_lexer.h
+++ b/version2.0/nasal_lexer.h
@@ -433,7 +433,7 @@ class nasal_lexer
 					++ptr;
 				}
 			}
-			std::cout<<">> [Pre-lexer] complete scanning. "<<error<<" error(s)."<<std::endl;
+			std::cout<<">> [Lexer] complete scanning. "<<error<<" error(s)."<<std::endl;
 			return;
 		}
 		void generate_detail_token()
@@ -541,7 +541,7 @@ class nasal_lexer
 					detail_token_list.push_back(detail_token);
 				}
 			}
-			std::cout<<">> [Detail-lexer] complete generating. "<<error<<" error(s)."<<std::endl;
+			std::cout<<">> [Lexer] complete generating. "<<error<<" error(s)."<<std::endl;
 			return;
 		}
 		int get_error()