use flex rule nodefault

Author: dcbaker

.editorconfig

@@ -6,7 +6,7 @@ indent_size = 4
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
-insert_final_newline = false
+insert_final_newline = true
 
 [{meson.build,meson_options.txt}]
 indent_size = 2

src/frontend/interpreter.l

@@ -2,6 +2,7 @@
 /* Copyright © 2021 Intel Corporation */
 
 %option noyywrap
+%option nodefault
 
 %{
 %}
@@ -11,7 +12,6 @@
 ,                 { std::cout << "comma" << std::endl;}
 [0-9]+            { std::cout << "number: " << yytext << std::endl; }
 [a-zA-Z0-9_.+-]+  { std::cout << "string: " << yytext << std::endl; }
-.                 { }
 
 %%
 
@@ -22,4 +22,4 @@ int main() {
         ;
     }
     return 0;
-}
+}