From 8f47297fa2e19c426a42b06bb5f8bf1406b8f0f3 Mon Sep 17 00:00:00 2001
From: Paul Ganssle <paul@ganssle.io>
Date: Mon, 29 Apr 2019 15:12:28 -0400
Subject: [PATCH] Add support for positional only arguments

PEP 570 adds "positional only" arguments to Python, which changes the
code object constructor. This adds support for Python 3.8.

Fixes GH #1943: https://github.com/HypothesisWorks/hypothesis/issues/1943
---
 hypothesis-python/src/hypothesis/internal/compat.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hypothesis-python/src/hypothesis/internal/compat.py b/hypothesis-python/src/hypothesis/internal/compat.py
index 73305bacd2..58f63715ac 100644
--- a/src/hypothesis/internal/compat.py
+++ b/src/hypothesis/internal/compat.py
@@ -392,6 +392,10 @@ def get_type_hints(thing):
         'co_cellvars',
     ]
 
+    if sys.version_info >= (3, 8, 0):
+        # PEP 570 added "positional only arguments"
+        CODE_FIELD_ORDER.insert(1, "co_posonlyargcount")
+
 
 def update_code_location(code, newfile, newlineno):
     """Take a code object and lie shamelessly about where it comes from.