Remove usage of parser module, deprecated in Python 3.9

Resolves https://bugzilla.redhat.com/show_bug.cgi?id=1787902

f606fef19d035719be6ed862f7f426a0e7c582e1.patch

@@ -0,0 +1,44 @@
+From 24898e06404fdade3c37c9229402ea817d068e75 Mon Sep 17 00:00:00 2001
+From: Bruno Oliveira <nicoddemus@gmail.com>
+Date: Sun, 5 Jan 2020 14:15:51 -0300
+Subject: [PATCH] Remove usage of parser module, deprecated in Python 3.9
+
+Fix #6404
+---
+ changelog/6404.trivial.rst  | 1 +
+ src/_pytest/_code/source.py | 9 ++-------
+ 2 files changed, 3 insertions(+), 7 deletions(-)
+ create mode 100644 changelog/6404.trivial.rst
+
+diff --git a/changelog/6404.trivial.rst b/changelog/6404.trivial.rst
+new file mode 100644
+index 0000000000..8252098b6a
+--- /dev/null
++++ b/changelog/6404.trivial.rst
+@@ -0,0 +1 @@
++Remove usage of ``parser`` module, deprecated in Python 3.9.
+diff --git a/src/_pytest/_code/source.py b/src/_pytest/_code/source.py
+index c8a4b6adf3..b35e97b9ce 100644
+--- a/src/_pytest/_code/source.py
++++ b/src/_pytest/_code/source.py
+@@ -123,18 +123,13 @@ def isparseable(self, deindent=True):
+         """ return True if source is parseable, heuristically
+             deindenting it by default.
+         """
+-        from parser import suite as syntax_checker
+-
+         if deindent:
+             source = str(self.deindent())
+         else:
+             source = str(self)
+         try:
+-            # compile(source+'\n', "x", "exec")
+-            syntax_checker(source + "\n")
+-        except KeyboardInterrupt:
+-            raise
+-        except Exception:
++            ast.parse(source)
++        except (SyntaxError, ValueError, TypeError):
+             return False
+         else:
+             return True

pytest.spec

@@ -6,6 +6,9 @@ License:        MIT
 URL:            https://pytest.org
 Source0:        %{pypi_source}
 
+# Remove usage of parser module, deprecated in Python 3.9
+Patch1:         https://github.com/pytest-dev/pytest/commit/f606fef19d035719be6ed862f7f426a0e7c582e1.patch
+
 # The test in this specfile use pytest-timeout
 # When building pytest for the first time with new Python version
 # that is not possible as it depends on pytest