Minor tweaks

Closes #500.

Author: JukkaL

mypy/parse.py

@@ -1568,7 +1568,7 @@ def expect_colon_and_break(self) -> Tuple[Token, Token]:
 
     def expect_break(self) -> Token:
         token = self.expect_type(Break)
-        if re.match(self.type_ignore_exp, token.pre):
+        if self.type_ignore_exp.match(token.pre):
             self.ignored_lines.add(token.line)
         return token
 

mypy/semanal.py

@@ -164,6 +164,8 @@ def visit_file(self, file_node: MypyFile, fnam: str) -> None:
         if self.cur_mod_id == 'builtins':
             remove_imported_names_from_symtable(self.globals, 'builtins')
 
+        self.errors.set_ignored_lines(set())
+
     def visit_func_def(self, defn: FuncDef) -> None:
         self.errors.push_function(defn.name())
         self.update_function_type_variables(defn)