From acd603496237a78b109ca9d89991539633cbbb99 Mon Sep 17 00:00:00 2001
From: hauntsaninja <>
Date: Wed, 7 Oct 2020 22:07:02 -0700
Subject: [PATCH] py39: fix mypyc complaint

I was trying to build wheels for Python 3.9 as part of #9536, but ran
into this issue. You'll notice a couple hundred lines up msullivan
points out that mypyc can't handle conditional method definition, so
that's not an option here.
---
 mypy/fastparse.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mypy/fastparse.py b/mypy/fastparse.py
index 2dafbf4e1454..0b72214100d8 100644
--- a/mypy/fastparse.py
+++ b/mypy/fastparse.py
@@ -1257,11 +1257,13 @@ def visit_Slice(self, n: ast3.Slice) -> SliceExpr:
 
     # ExtSlice(slice* dims)
     def visit_ExtSlice(self, n: ast3.ExtSlice) -> TupleExpr:
-        return TupleExpr(self.translate_expr_list(n.dims))
+        # cast for mypyc's benefit on Python 3.9
+        return TupleExpr(self.translate_expr_list(cast(Any, n.dims)))
 
     # Index(expr value)
     def visit_Index(self, n: Index) -> Node:
-        return self.visit(n.value)
+        # cast for mypyc's benefit on Python 3.9
+        return self.visit(cast(Any, n.value))
 
 
 class TypeConverter: