allows system cython packages to work

build/pkgs/cython/patches/5690.patch

@@ -0,0 +1,48 @@
+diff --git a/Cython/Debugger/DebugWriter.py b/Cython/Debugger/DebugWriter.py
+index 8b1fb75b027..2c3c310fc64 100644
+--- a/Cython/Debugger/DebugWriter.py
++++ b/Cython/Debugger/DebugWriter.py
+@@ -18,6 +18,21 @@
+             etree = None
+
+ from ..Compiler import Errors
++from ..Compiler.StringEncoding import EncodedString
++
++
++def is_valid_tag(name):
++    """
++    Names like '.0' are used internally for arguments
++    to functions creating generator expressions,
++    however they are not identifiers.
++
++    See https://github.com/cython/cython/issues/5552
++    """
++    if isinstance(name, EncodedString):
++        if name.startswith(".") and name[1:].isdecimal():
++            return False
++    return True
+
+
+ class CythonDebugWriter(object):
+@@ -39,14 +54,17 @@ def __init__(self, output_dir):
+         self.start('cython_debug', attrs=dict(version='1.0'))
+
+     def start(self, name, attrs=None):
+-        self.tb.start(name, attrs or {})
++        if is_valid_tag(name):
++            self.tb.start(name, attrs or {})
+
+     def end(self, name):
+-        self.tb.end(name)
++        if is_valid_tag(name):
++            self.tb.end(name)
+
+     def add_entry(self, name, **attrs):
+-        self.tb.start(name, attrs)
+-        self.tb.end(name)
++        if is_valid_tag(name):
++            self.tb.start(name, attrs)
++            self.tb.end(name)
+
+     def serialize(self):
+         self.tb.end('Module')