Removing `operator T&&() &&` from smart_holder_type_caster, for compatibility...

Removing `operator T&&() &&` from smart_holder_type_caster, for compatibility with the behavior of type_caster_base. Enables reverting 2 of 3 test manipulations applied under commit 249df7cb. The manipulation in test_factory_constructors.py is NOT reverted in this commit.

[skip ci]

include/pybind11/cast.h

@@ -1385,19 +1385,15 @@ struct smart_holder_type_caster : smart_holder_type_caster_load<T>,
     using cast_op_type = conditional_t<
         std::is_same<remove_reference_t<T_>, T const *>::value,
         T const *,
-        conditional_t<
-            std::is_same<remove_reference_t<T_>, T *>::value,
-            T *,
-            conditional_t<std::is_same<T_, T const &>::value,
-                          T const &,
-                          conditional_t<std::is_same<T_, T &>::value,
-                                        T &,
-                                        conditional_t<std::is_same<T_, T &&>::value, T &&, T>>>>>;
+        conditional_t<std::is_same<remove_reference_t<T_>, T *>::value,
+                      T *,
+                      conditional_t<std::is_same<T_, T const &>::value,
+                                    T const &,
+                                    conditional_t<std::is_same<T_, T &>::value, T &, T>>>>;
 
     // clang-format off
 
     operator T()        { return this->loaded_as_lvalue_ref(); }
-    operator T&&() &&   { return this->loaded_as_rvalue_ref(); }
     operator T const&() { return this->loaded_as_lvalue_ref(); }
     operator T&()       { return this->loaded_as_lvalue_ref(); }
     operator T const*() { return this->loaded_as_raw_ptr_unowned(); }

tests/test_class_sh_basic.py

@@ -23,8 +23,8 @@ def test_cast():
 
 
 def test_load():
-    assert m.pass_valu_atyp(m.atyp("Valu")) == "pass_valu:Valu.MvCtor.MvCtor"
-    assert m.pass_rref_atyp(m.atyp("Rref")) == "pass_rref:Rref.MvCtor"
+    assert m.pass_valu_atyp(m.atyp("Valu")) == "pass_valu:Valu.MvCtor.CpCtor"
+    assert m.pass_rref_atyp(m.atyp("Rref")) == "pass_rref:Rref.MvCtor.CpCtor"
     assert m.pass_cref_atyp(m.atyp("Cref")) == "pass_cref:Cref.MvCtor"
     assert m.pass_mref_atyp(m.atyp("Mref")) == "pass_mref:Mref.MvCtor"
     assert m.pass_cptr_atyp(m.atyp("Cptr")) == "pass_cptr:Cptr.MvCtor"

tests/test_methods_and_attributes.py

@@ -62,7 +62,7 @@ def test_methods_and_attributes():
     assert cstats.alive() == 0
     assert cstats.values() == ["32"]
     assert cstats.default_constructions == 1
-    assert cstats.copy_constructions in (2, 1)  # SMART_HOLDER_WIP
+    assert cstats.copy_constructions == 2
     assert cstats.move_constructions >= 2
     assert cstats.copy_assignments == 0
     assert cstats.move_assignments == 0

tests/test_virtual_functions.py

@@ -230,7 +230,7 @@ def test_move_support():
     assert nc_stats.values() == ["4", "9", "9", "9"]
     assert mv_stats.values() == ["4", "5", "7", "7"]
     assert nc_stats.copy_constructions == 0
-    assert mv_stats.copy_constructions in (1, 0)  # SMART_HOLDER_WIP
+    assert mv_stats.copy_constructions == 1
     assert nc_stats.move_constructions >= 0
     assert mv_stats.move_constructions >= 0