From 2d6a7ec518db01f525a4e8d75699e93ff9e6eaf0 Mon Sep 17 00:00:00 2001
From: David Fisher <ddfisher@dropbox.com>
Date: Wed, 6 Jul 2016 15:00:40 -0700
Subject: [PATCH] Fix crash when function annotation has more args than
 function

---
 mypy/semanal.py                     |  2 +-
 test-data/unit/check-fastparse.test | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/mypy/semanal.py b/mypy/semanal.py
index c0aea9585c2b..ad3b37ffb73b 100644
--- a/mypy/semanal.py
+++ b/mypy/semanal.py
@@ -542,7 +542,7 @@ def check_function_signature(self, fdef: FuncItem) -> None:
             extra_anys = [AnyType()] * (len(fdef.arguments) - len(sig.arg_types))
             sig.arg_types.extend(extra_anys)
         elif len(sig.arg_types) > len(fdef.arguments):
-            self.fail('Type signature has too many arguments', fdef)
+            self.fail('Type signature has too many arguments', fdef, blocker=True)
 
     def visit_class_def(self, defn: ClassDef) -> None:
         self.clean_up_bases_and_infer_type_variables(defn)
diff --git a/test-data/unit/check-fastparse.test b/test-data/unit/check-fastparse.test
index eecacafe9c26..7ef5bd34e0ed 100644
--- a/test-data/unit/check-fastparse.test
+++ b/test-data/unit/check-fastparse.test
@@ -154,3 +154,19 @@ def f(a,        # type: A
 [builtins fixtures/dict.py]
 [out]
 main: note: In function "f":
+
+[case testFasterParseTooManyArgumentsAnnotation]
+# options: fast_parser
+def f():  # E: Type signature has too many arguments
+    # type: (int) -> None
+    pass
+[out]
+main: note: In function "f":
+
+[case testFasterParseTooFewArgumentsAnnotation]
+# options: fast_parser
+def f(x):  # E: Type signature has too few arguments
+    # type: () -> None
+    pass
+[out]
+main: note: In function "f":