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, 6 insertions, 8 deletions

diff --git a/test/sql/test_roles.py b/test/sql/test_roles.py
index abbef8e28..5c9ed3588 100644
--- a/test/sql/test_roles.py
+++ b/test/sql/test_roles.py
@@ -226,15 +226,13 @@ class RoleTest(fixtures.TestBase):
         ):
             expect(roles.ExpressionElementRole, Thing())
 
-    def test_statement_text_coercion(self):
-        with testing.expect_deprecated_20(
-            "Using plain strings to indicate SQL statements"
+    def test_no_statement_text_coercion(self):
+        with testing.expect_raises_message(
+            exc.ArgumentError,
+            r"Textual SQL expression 'select \* from table' should be "
+            "explicitly declared",
         ):
-            is_true(
-                expect(roles.StatementRole, "select * from table").compare(
-                    text("select * from table")
-                )
-            )
+            expect(roles.StatementRole, "select * from table")
 
     def test_select_statement_no_text_coercion(self):
         assert_raises_message(