Remove all remaining removed_in_20 warnings slated for removal

Finalize all remaining removed-in-2.0 changes so that we
can begin doing pep-484 typing without old things
getting in the way (we will also have to do public_factory).

note there are a few "moved_in_20()" and "became_legacy_in_20()"
warnings still in place.  The SQLALCHEMY_WARN_20 variable
is now removed.

Also removed here are the legacy "in place mutators" for Select
statements, and some keyword-only argument signatures in Core
have been added.

Also in the big change department, the ORM mapper() function
is removed entirely; the Mapper class is otherwise unchanged,
just the public-facing API function.  Mappers are now always
given a registry in which to participate, however the
argument signature of Mapper is not changed. ideally "registry"
would be the first positional argument.

Fixes: #7257

Change-Id: Ic70c57b9f1cf7eb996338af5183b11bdeb3e1623

1 files changed, 2 insertions, 15 deletions

diff --git a/test/sql/test_case_statement.py b/test/sql/test_case_statement.py
index db7f16194..6893a9442 100644
--- a/test/sql/test_case_statement.py
+++ b/test/sql/test_case_statement.py
@@ -215,23 +215,10 @@ class CaseTest(fixtures.TestBase, AssertsCompiledSQL):
     def test_when_dicts(self, test_case, expected):
         t = table("test", column("col1"))
 
-        whens, value, else_ = testing.resolve_lambda(test_case, t=t)
-
-        def _case_args(whens, value=None, else_=None):
-            kw = {}
-            if value is not None:
-                kw["value"] = value
-            if else_ is not None:
-                kw["else_"] = else_
-
-            return case(whens, **kw)
-
-            # note: 1.3 also does not allow this form
-            # case([whens], **kw)
+        when_dict, value, else_ = testing.resolve_lambda(test_case, t=t)
 
         self.assert_compile(
-            _case_args(whens=whens, value=value, else_=else_),
-            expected,
+            case(when_dict, value=value, else_=else_), expected
         )
 
     def test_text_doesnt_explode(self, connection):