skip to the next line and reset column after `=end`

src/parse.y

@@ -4206,6 +4206,9 @@ parser_yylex(parser_state *p)
             }
             c = nextc(p);
           } while (!(c < 0 || isspace(c)));
+          if (c != '\n') skip(p, '\n');
+          p->lineno++;
+          p->column = 0;
           goto retry;
         }
       }

test/t/syntax.rb

@@ -309,6 +309,6 @@ this is a comment that has extra after =begin and =end with spaces after it
 =end  
 =begin	this is a comment
 this is a comment that has extra after =begin and =end with tabs after it
-=end
+=end	xxxxxxxxxxxxxxxxxxxxxxxxxx
   true
 end