Handle pyreadline failure (Windows + Python 3.10+)

Also, axe the explicit pyreadline fallback and dependency (as pyreadline is unmaintained).

NEWS.rst

@@ -9,10 +9,12 @@ Other Breaking Changes
   `(import [foo [bar]])` is now `(import foo [bar])`
   and `(import [foo :as baz])` is now `(import foo :as baz)`.
   To import all names from a module, use `(import foo *)`.
+* Dropped support for `pyreadline`
 
 Bug Fixes
 ------------------------------
 * Improved error messages for illegal uses of `finally` and `else`.
+* Fixed a crash on Windows due to Readline
 
 1.0a3 (released 2021-07-09)
 ==============================

hy/completer.py

@@ -16,13 +16,14 @@
 
 try:
     import readline
-except ImportError:
-    try:
-        import pyreadline.rlmain
-        import pyreadline.unicode_helper  # NOQA
-        import readline
-    except ImportError:
+except AttributeError as e:
+    # https://github.com/pyreadline/pyreadline/issues/65
+    if "module 'collections' has no attribute 'Callable'" in str(e):
         docomplete = False
+    else:
+        raise
+except ImportError:
+    docomplete = False
 
 if docomplete:
     if sys.platform == 'darwin' and 'libedit' in readline.__doc__:

setup.py

@@ -69,7 +69,6 @@ def run(self):
         'funcparserlib>=0.3.6',
         'colorama',
         'astor>=0.8 ; python_version < "3.9"',
-        'pyreadline>=2.1 ; os_name == "nt"',
     ],
     cmdclass=dict(install=Install),
     entry_points={