test 7

src/lexer.l

@@ -13,7 +13,8 @@
 ^[ \t]*\r?\n            { /* Ignore lines containing whitespace only */ }
 ^[ \t]*#.*\n            { /* Ignore comment-only lines */ }
 
-^[ \t]+ {
+
+^[ \t]* {
     int col = indent_stack.calculateColumn(yytext, yyleng);
     auto action = indent_stack.updateIndentation(col);
 
@@ -21,6 +22,13 @@
     if (action == IndentAction::Dedent) return yy::parser::token::TOK_DEDENT;
 }
 
+^. {
+    // Line starts with non-whitespace (column 0)
+    auto action = indent_stack.updateIndentation(0);
+    yyless(0);  
+    if (action == IndentAction::Dedent) return yy::parser::token::TOK_DEDENT;
+}
+
 \n                      { return yy::parser::token::TOK_NEWLINE; }
 
 def                     { return yy::parser::token::TOK_KW_DEF; }