Switch to using standalone Outcome library.

docs/source/conf.py

@@ -70,7 +70,7 @@ def setup(app):
 
 intersphinx_mapping = {
     "python": ('https://docs.python.org/3', None),
-    "outcome": ('https://outcome.readthedocs.org', None),
+    "outcome": ('https://outcome.readthedocs.org/en/latest/', None),
 }
 
 autodoc_member_order = "bysource"

trio/__init__.py

@@ -65,6 +65,22 @@
 from . import abc
 from . import ssl
 # Not imported by default: testing
+_deprecate.enable_attribute_deprecations(hazmat.__name__)
+
+__deprecated_attributes__ = {
+    "Result":
+        _deprecate.DeprecatedAttribute(
+            hazmat.Result, "0.5.0", issue=494, instead="outcome.Outcome"
+        ),
+    "Value":
+        _deprecate.DeprecatedAttribute(
+            hazmat.Value, "0.5.0", issue=494, instead="outcome.Value"
+        ),
+    "Error":
+        _deprecate.DeprecatedAttribute(
+            hazmat.Error, "0.5.0", issue=494, instead="outcome.Error"
+        )
+}
 
 # Having the public path in .__module__ attributes is important for:
 # - exception names in printed tracebacks

trio/_core/_result.py

@@ -30,19 +30,4 @@ async def acapture(cls, async_fn, *args):
 # ensure that isinstance(Value(), Result)/issubclass(Value, Result) and etc
 # don't break
 Result.register(Value)
-Result.register(Error)
-
-__deprecated_attributes__ = {
-    "Result":
-        _deprecate.DeprecatedAttribute(
-            Result, "0.5.0", issue=494, instead="outcome.Outcome"
-        ),
-    "Value":
-        _deprecate.DeprecatedAttribute(
-            Value, "0.5.0", issue=494, instead="outcome.Value"
-        ),
-    "Error":
-        _deprecate.DeprecatedAttribute(
-            Error, "0.5.0", issue=494, instead="outcome.Error"
-        )
-}
+Result.register(Error)