From 3a16ebb46313090ad665d06de1741560297cc608 Mon Sep 17 00:00:00 2001
From: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Date: Wed, 14 Oct 2020 00:47:47 -0700
Subject: [PATCH] builtins: int can accept __trunc__-able (#4665)

Refer to https://docs.python.org/3/reference/datamodel.html#object.__trunc__
Fixes https://github.com/python/mypy/issues/9588

Co-authored-by: hauntsaninja <>
---
 stdlib/2/__builtin__.pyi  | 5 ++++-
 stdlib/2and3/builtins.pyi | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/stdlib/2/__builtin__.pyi b/stdlib/2/__builtin__.pyi
index 403bed0cb..da882b108 100644
--- a/stdlib/2/__builtin__.pyi
+++ b/stdlib/2/__builtin__.pyi
@@ -69,6 +69,9 @@ if sys.version_info >= (3, 9):
 class _SupportsIndex(Protocol):
     def __index__(self) -> int: ...
 
+class _SupportsTrunc(Protocol):
+    def __trunc__(self) -> int: ...
+
 class _SupportsLessThan(Protocol):
     def __lt__(self, __other: Any) -> bool: ...
 
@@ -182,7 +185,7 @@ class super(object):
 
 class int:
     @overload
-    def __new__(cls: Type[_T], x: Union[Text, bytes, SupportsInt, _SupportsIndex] = ...) -> _T: ...
+    def __new__(cls: Type[_T], x: Union[Text, bytes, SupportsInt, _SupportsIndex, _SupportsTrunc] = ...) -> _T: ...
     @overload
     def __new__(cls: Type[_T], x: Union[Text, bytes, bytearray], base: int) -> _T: ...
     if sys.version_info >= (3, 8):
diff --git a/stdlib/2and3/builtins.pyi b/stdlib/2and3/builtins.pyi
index 403bed0cb..da882b108 100644
--- a/stdlib/2and3/builtins.pyi
+++ b/stdlib/2and3/builtins.pyi
@@ -69,6 +69,9 @@ if sys.version_info >= (3, 9):
 class _SupportsIndex(Protocol):
     def __index__(self) -> int: ...
 
+class _SupportsTrunc(Protocol):
+    def __trunc__(self) -> int: ...
+
 class _SupportsLessThan(Protocol):
     def __lt__(self, __other: Any) -> bool: ...
 
@@ -182,7 +185,7 @@ class super(object):
 
 class int:
     @overload
-    def __new__(cls: Type[_T], x: Union[Text, bytes, SupportsInt, _SupportsIndex] = ...) -> _T: ...
+    def __new__(cls: Type[_T], x: Union[Text, bytes, SupportsInt, _SupportsIndex, _SupportsTrunc] = ...) -> _T: ...
     @overload
     def __new__(cls: Type[_T], x: Union[Text, bytes, bytearray], base: int) -> _T: ...
     if sys.version_info >= (3, 8):