lexer unknown token passthrough

.gitignore

@@ -15,3 +15,6 @@ parser.tab.c
 parser.tab.h
 build
 /Testing/
+CTestTestfile.cmake
+DartConfiguration.tcl
+*.cmake

src/lex/lexer.l

@@ -94,5 +94,5 @@
 \"([^\"\n])*\" {DEBUG("\"%s\" tokenized with \'ValStr\'", yytext); yylval.string = strdup(yytext); return(ValStr);};
 \"\"\"([^\"\n]|\\\n)*\"\"\" {DEBUG("\"%s\" tokenized with \'ValMultistr\'", yytext); yylval.string = strdup(yytext); return(ValMultistr);};
 [ \r\t] { /* ignore whitespace */ };
-. { };
+. { return yytext[0]; /* passthrough unknown token, let parser handle the error */ };
 %%