diff --git a/compiler/test/compilable/fix21647.d b/compiler/test/compilable/fix21647.d
index 58f144045d32..f26fd9523c6d 100644
--- a/compiler/test/compilable/fix21647.d
+++ b/compiler/test/compilable/fix21647.d
@@ -1,5 +1,5 @@
 /*
-REQUIRED_ARGS: -preview=rvaluerefparam
+REQUIRED_ARGS:
 TEST_OUTPUT:
 ---
 cast(void)0
diff --git a/compiler/test/compilable/issue20704.d b/compiler/test/compilable/issue20704.d
index ec95828007fc..529dcfc3641b 100644
--- a/compiler/test/compilable/issue20704.d
+++ b/compiler/test/compilable/issue20704.d
@@ -1,6 +1,6 @@
 /*
 https://issues.dlang.org/show_bug.cgi?id=20704
-REQUIRED_ARGS: -preview=rvaluerefparam
+REQUIRED_ARGS:
  */
 
 void f1(T)(const auto ref T arg = T.init) {}
diff --git a/compiler/test/compilable/issue20705.d b/compiler/test/compilable/issue20705.d
index 76a364e129b9..c8fef59fa08d 100644
--- a/compiler/test/compilable/issue20705.d
+++ b/compiler/test/compilable/issue20705.d
@@ -1,4 +1,4 @@
-// REQUIRED_ARGS: -preview=rvaluerefparam
+// REQUIRED_ARGS:
 struct Foo
 {
     int[] a;
diff --git a/compiler/test/compilable/previewhelp.d b/compiler/test/compilable/previewhelp.d
index 14d5781964e1..3291708549a6 100644
--- a/compiler/test/compilable/previewhelp.d
+++ b/compiler/test/compilable/previewhelp.d
@@ -12,7 +12,6 @@ Upcoming language changes listed by -preview=name:
   =bitfields        add C-like bitfields (https://github.com/dlang/dlang.org/pull/3190)
   =fieldwise        use fieldwise comparisons for struct equality (https://dlang.org/changelog/2.085.0.html#no-cmpsb)
   =fixAliasThis     when a symbol is resolved, check alias this scope before going to upper scopes (https://github.com/dlang/dmd/pull/8885)
-  =rvaluerefparam   enable rvalue arguments to ref parameters (https://gist.github.com/andralex/e5405a5d773f07f73196c05f8339435a)
   =nosharedaccess   disable access to shared memory objects (https://dlang.org/spec/const3.html#shared)
   =in               `in` on parameters means `scope const [ref]` and accepts rvalues (https://dlang.org/spec/function.html#in-params)
   =inclusiveincontracts 'in' contracts of overridden methods must be a superset of parent contract (https://dlang.org/changelog/2.095.0.html#inclusive-incontracts)
diff --git a/compiler/test/compilable/reverthelp.d b/compiler/test/compilable/reverthelp.d
index febbba1445a4..150c8697d338 100644
--- a/compiler/test/compilable/reverthelp.d
+++ b/compiler/test/compilable/reverthelp.d
@@ -9,5 +9,6 @@ Revertable language changes listed by -revert=name:
   =dip1000          revert DIP1000 changes (Scoped Pointers) (https://github.com/dlang/DIPs/blob/master/DIPs/other/DIP1000.md)
   =intpromote       revert integral promotions for unary + - ~ operators
   =dtorfields       don't destruct fields of partially constructed objects
+  =rvaluerefparam   revert rvalue arguments to ref parameters (https://gist.github.com/andralex/e5405a5d773f07f73196c05f8339435a)
 ----
 */
diff --git a/compiler/test/compilable/rvalueref.d b/compiler/test/compilable/rvalueref.d
index 1c96c36f1f5b..9ad60e27dd8e 100644
--- a/compiler/test/compilable/rvalueref.d
+++ b/compiler/test/compilable/rvalueref.d
@@ -1,4 +1,4 @@
-/* REQUIRED_ARGS: -preview=rvaluerefparam
+/* REQUIRED_ARGS:
  */
 
 struct AS
diff --git a/compiler/test/fail_compilation/b20011.d b/compiler/test/fail_compilation/b20011.d
index 50ef6aff6097..340a7f9abedf 100644
--- a/compiler/test/fail_compilation/b20011.d
+++ b/compiler/test/fail_compilation/b20011.d
@@ -1,19 +1,13 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/b20011.d(28): Error: cannot modify expression `S1(cast(ubyte)0u).member` because it is not an lvalue
-fail_compilation/b20011.d(31): Error: cannot modify expression `S2(null).member` because it is not an lvalue
-fail_compilation/b20011.d(32): Error: cannot modify expression `S2(null).member` because it is not an lvalue
-fail_compilation/b20011.d(35): Error: cannot modify expression `U1(cast(ubyte)0u, ).m2` because it is not an lvalue
-fail_compilation/b20011.d(40): Error: function `assignableByRef` is not callable using argument types `(ubyte)`
-fail_compilation/b20011.d(40):        cannot pass rvalue argument `S1(cast(ubyte)0u).member` of type `ubyte` to parameter `ref ubyte p`
-fail_compilation/b20011.d(37):        `b20011.main.assignableByRef(ref ubyte p)` declared here
-fail_compilation/b20011.d(41): Error: function `assignableByOut` is not callable using argument types `(ubyte)`
-fail_compilation/b20011.d(41):        cannot pass rvalue argument `S1(cast(ubyte)0u).member` of type `ubyte` to parameter `out ubyte p`
-fail_compilation/b20011.d(38):        `b20011.main.assignableByOut(out ubyte p)` declared here
-fail_compilation/b20011.d(42): Error: function `assignableByConstRef` is not callable using argument types `(ubyte)`
-fail_compilation/b20011.d(42):        cannot pass rvalue argument `S1(cast(ubyte)0u).member` of type `ubyte` to parameter `ref const(ubyte) p`
-fail_compilation/b20011.d(39):        `b20011.main.assignableByConstRef(ref const(ubyte) p)` declared here
+fail_compilation/b20011.d(22): Error: cannot modify expression `S1(cast(ubyte)0u).member` because it is not an lvalue
+fail_compilation/b20011.d(25): Error: cannot modify expression `S2(null).member` because it is not an lvalue
+fail_compilation/b20011.d(26): Error: cannot modify expression `S2(null).member` because it is not an lvalue
+fail_compilation/b20011.d(29): Error: cannot modify expression `U1(cast(ubyte)0u, ).m2` because it is not an lvalue
+fail_compilation/b20011.d(35): Error: function `assignableByOut` is not callable using argument types `(ubyte)`
+fail_compilation/b20011.d(35):        cannot pass rvalue argument `S1(cast(ubyte)0u).member` of type `ubyte` to parameter `out ubyte p`
+fail_compilation/b20011.d(32):        `b20011.main.assignableByOut(out ubyte p)` declared here
 ---
 */
 module b20011;
diff --git a/compiler/test/fail_compilation/fail20183.d b/compiler/test/fail_compilation/fail20183.d
index 9d99212adac7..6770bdd44997 100644
--- a/compiler/test/fail_compilation/fail20183.d
+++ b/compiler/test/fail_compilation/fail20183.d
@@ -1,9 +1,7 @@
 /* REQUIRED_ARGS: -preview=dip1000
 TEST_OUTPUT:
 ---
-fail_compilation/fail20183.d(1016): Error: function `addr` is not callable using argument types `(int)`
-fail_compilation/fail20183.d(1016):        cannot pass rvalue argument `S(0).i` of type `int` to parameter `return ref int b`
-fail_compilation/fail20183.d(1004):        `fail20183.addr(return ref int b)` declared here
+fail_compilation/fail20183.d(1016): Error: address of variable `__rvalue2` assigned to `p` with longer lifetime
 fail_compilation/fail20183.d(1017): Error: address of expression temporary returned by `s()` assigned to `q` with longer lifetime
 fail_compilation/fail20183.d(1018): Error: address of struct literal `S(0)` assigned to `r` with longer lifetime
 ---
diff --git a/compiler/test/fail_compilation/fail7603a.d b/compiler/test/fail_compilation/fail7603a.d
deleted file mode 100644
index a106a566a5c4..000000000000
--- a/compiler/test/fail_compilation/fail7603a.d
+++ /dev/null
@@ -1,7 +0,0 @@
-/*
-TEST_OUTPUT:
----
-fail_compilation/fail7603a.d(7): Error: cannot create default argument for `ref` / `out` parameter from constant `true`
----
-*/
-void test(ref bool val = true) { }
diff --git a/compiler/test/fail_compilation/fail7603b.d b/compiler/test/fail_compilation/fail7603b.d
index a6524221afd8..e3d1a7f398f3 100644
--- a/compiler/test/fail_compilation/fail7603b.d
+++ b/compiler/test/fail_compilation/fail7603b.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7603b.d(7): Error: cannot create default argument for `ref` / `out` parameter from constant `true`
+fail_compilation/fail7603b.d(7): Error: cannot create default argument for `out` parameter from constant `true`
 ---
 */
 void test(out bool val = true) { }
diff --git a/compiler/test/fail_compilation/fail7603c.d b/compiler/test/fail_compilation/fail7603c.d
deleted file mode 100644
index 3d030fc9668c..000000000000
--- a/compiler/test/fail_compilation/fail7603c.d
+++ /dev/null
@@ -1,8 +0,0 @@
-/*
-TEST_OUTPUT:
----
-fail_compilation/fail7603c.d(8): Error: cannot create default argument for `ref` / `out` parameter from constant `3`
----
-*/
-enum x = 3;
-void test(ref int val = x) { }
diff --git a/compiler/test/fail_compilation/fail9773.d b/compiler/test/fail_compilation/fail9773.d
deleted file mode 100644
index 26447a73914e..000000000000
--- a/compiler/test/fail_compilation/fail9773.d
+++ /dev/null
@@ -1,10 +0,0 @@
-/*
-TEST_OUTPUT:
----
-fail_compilation/fail9773.d(7): Error: cannot create default argument for `ref` / `out` parameter from expression `""` because it is not an lvalue
----
-*/
-void f(ref string a = "")
-{
-    a = "crash and burn";
-}
diff --git a/compiler/test/fail_compilation/fail9891.d b/compiler/test/fail_compilation/fail9891.d
index 0c2384fccfa4..b3a1e1625646 100644
--- a/compiler/test/fail_compilation/fail9891.d
+++ b/compiler/test/fail_compilation/fail9891.d
@@ -1,9 +1,8 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail9891.d(13): Error: expression `i` of type `immutable(int)` is not implicitly convertible to type `ref int` of parameter `n`
-fail_compilation/fail9891.d(18): Error: expression `i` of type `immutable(int)` is not implicitly convertible to type `out int` of parameter `n`
-fail_compilation/fail9891.d(23): Error: cannot create default argument for `ref` / `out` parameter from expression `prop()` because it is not an lvalue
+fail_compilation/fail9891.d(12): Error: expression `i` of type `immutable(int)` is not implicitly convertible to type `ref int` of parameter `n`
+fail_compilation/fail9891.d(17): Error: expression `i` of type `immutable(int)` is not implicitly convertible to type `out int` of parameter `n`
 ---
 */
 
@@ -19,8 +18,3 @@ void f2(out int n = i)
 {
     ++n;
 }
-
-void f3(ref int n = prop)
-{
-    ++n;
-}
diff --git a/compiler/test/fail_compilation/issue20704.d b/compiler/test/fail_compilation/issue20704.d
deleted file mode 100644
index ba91b0635724..000000000000
--- a/compiler/test/fail_compilation/issue20704.d
+++ /dev/null
@@ -1,39 +0,0 @@
-/* TEST_OUTPUT:
----
-fail_compilation/issue20704.d(17): Error: cannot create default argument for `ref` / `out` parameter from constant `0`
-fail_compilation/issue20704.d(28): Error: template instance `issue20704.f2!int` error instantiating
-fail_compilation/issue20704.d(19): Error: cannot create default argument for `ref` / `out` parameter from constant `0`
-fail_compilation/issue20704.d(30): Error: template instance `issue20704.f4!int` error instantiating
-fail_compilation/issue20704.d(17): Error: cannot create default argument for `ref` / `out` parameter from expression `S(0)` because it is not an lvalue
-fail_compilation/issue20704.d(36): Error: template instance `issue20704.f2!(S)` error instantiating
-fail_compilation/issue20704.d(17): Error: cannot create default argument for `ref` / `out` parameter from expression `null` because it is not an lvalue
-fail_compilation/issue20704.d(38): Error: template instance `issue20704.f2!(C)` error instantiating
----
-*/
-
-// https://issues.dlang.org/show_bug.cgi?id=20704
-
-void f1(T)(const auto ref T arg = T.init) {}
-void f2(T)(const      ref T arg = T.init) {}
-void f3(T)(const auto ref T arg = 0) {}
-void f4(T)(const      ref T arg = 0) {}
-
-struct S { int _; }
-class C { int _; }
-
-void main ()
-{
-    int i;
-    f1!int(i);
-    f2!int(i);
-    f3!int(i);
-    f4!int(i);
-    f1!int();
-    f2!int();
-    f3!int();
-    f4!int();
-    f1!S();
-    f2!S();
-    f1!C();
-    f2!C();
-}
diff --git a/compiler/test/fail_compilation/test21807.d b/compiler/test/fail_compilation/test21807.d
index aaa56f970987..4c05cefa95eb 100644
--- a/compiler/test/fail_compilation/test21807.d
+++ b/compiler/test/fail_compilation/test21807.d
@@ -23,33 +23,3 @@ class Foo
 		ca = getSArray();
 	}
 }
-
-/*
-TEST_OUTPUT:
----
-fail_compilation/test21807.d(117): Error: function `addr` is not callable using argument types `(int)`
-fail_compilation/test21807.d(117):        cannot pass rvalue argument `S(0).i` of type `int` to parameter `return ref int b`
-fail_compilation/test21807.d(106):        `test21807.addr(return ref int b)` declared here
----
-*/
-#line 100
-
-struct S
-{
-	int i;
-}
-
-int* addr(return ref int b)
-{
-	return &b;
-}
-
-class Foo2
-{
-	int* ptr;
-
-	this()
-	{
-		ptr = addr(S().i);  // struct temporary
-	}
-}
diff --git a/compiler/test/fail_compilation/tolvalue.d b/compiler/test/fail_compilation/tolvalue.d
index e911dff77296..ed75aa7be24c 100644
--- a/compiler/test/fail_compilation/tolvalue.d
+++ b/compiler/test/fail_compilation/tolvalue.d
@@ -1,18 +1,15 @@
 /**
 TEST_OUTPUT:
 ---
-fail_compilation/tolvalue.d(28): Error: cannot take address of template `templateFunc(T)()`, perhaps instantiate it first
-fail_compilation/tolvalue.d(29): Error: cannot take address of type `int`
-fail_compilation/tolvalue.d(30): Error: cannot take address of constant `3`
-fail_compilation/tolvalue.d(31): Error: cannot take address of operator `$`
-fail_compilation/tolvalue.d(32): Error: cannot take address of compiler-generated variable `__ctfe`
-fail_compilation/tolvalue.d(33): Error: cannot take address of manifest constant `f`
-fail_compilation/tolvalue.d(38): Error: cannot create default argument for `ref` / `out` parameter from constant `3`
-fail_compilation/tolvalue.d(39): Error: cannot create default argument for `ref` / `out` parameter from compiler-generated variable `__ctfe`
-fail_compilation/tolvalue.d(40): Error: cannot create default argument for `ref` / `out` parameter from manifest constant `f`
-fail_compilation/tolvalue.d(45): Error: cannot modify constant `3`
-fail_compilation/tolvalue.d(46): Error: cannot modify compiler-generated variable `__ctfe`
-fail_compilation/tolvalue.d(47): Error: cannot modify manifest constant `f`
+fail_compilation/tolvalue.d(25): Error: cannot take address of template `templateFunc(T)()`, perhaps instantiate it first
+fail_compilation/tolvalue.d(26): Error: cannot take address of type `int`
+fail_compilation/tolvalue.d(27): Error: cannot take address of constant `3`
+fail_compilation/tolvalue.d(28): Error: cannot take address of operator `$`
+fail_compilation/tolvalue.d(29): Error: cannot take address of compiler-generated variable `__ctfe`
+fail_compilation/tolvalue.d(30): Error: cannot take address of manifest constant `f`
+fail_compilation/tolvalue.d(35): Error: cannot modify constant `3`
+fail_compilation/tolvalue.d(36): Error: cannot modify compiler-generated variable `__ctfe`
+fail_compilation/tolvalue.d(37): Error: cannot modify manifest constant `f`
 ---
 */
 
@@ -33,13 +30,6 @@ void addr()
     auto x6 = &E.f;
 }
 
-void refArg()
-{
-    void f0(ref int = 3) {}
-    void f1(ref bool = __ctfe) {}
-    void f3(ref E = E.f) {}
-}
-
 void inc(int lz)
 {
     3++;
diff --git a/compiler/test/runnable/overload.d b/compiler/test/runnable/overload.d
index c413ade029a6..4886aa918934 100644
--- a/compiler/test/runnable/overload.d
+++ b/compiler/test/runnable/overload.d
@@ -1,5 +1,5 @@
 /*
-REQUIRED_ARGS: -preview=rvaluerefparam
+REQUIRED_ARGS:
 EXTRA_SOURCES: imports/ovs1528a.d imports/ovs1528b.d
 EXTRA_SOURCES: imports/template_ovs1.d imports/template_ovs2.d imports/template_ovs3.d
 EXTRA_FILES: imports/m8668a.d imports/m8668b.d imports/m8668c.d
diff --git a/compiler/test/runnable/structlit.d b/compiler/test/runnable/structlit.d
index d4a6bd6061b1..8970254f6ce6 100644
--- a/compiler/test/runnable/structlit.d
+++ b/compiler/test/runnable/structlit.d
@@ -1,5 +1,5 @@
 /*
-REQUIRED_ARGS: -preview=rvaluerefparam
+REQUIRED_ARGS:
 RUN_OUTPUT:
 ---
 Success
diff --git a/compiler/test/runnable/template9.d b/compiler/test/runnable/template9.d
index 7a55b2dbfee0..eded936076e1 100644
--- a/compiler/test/runnable/template9.d
+++ b/compiler/test/runnable/template9.d
@@ -1,5 +1,5 @@
 /*
-REQUIRED_ARGS: -preview=rvaluerefparam
+REQUIRED_ARGS:
 PERMUTE_ARGS:
 EXTRA_FILES: imports/testmangle.d
 TEST_OUTPUT:
diff --git a/compiler/test/runnable/testassign.d b/compiler/test/runnable/testassign.d
index c2b8a513ee14..e7583bbaf3b9 100644
--- a/compiler/test/runnable/testassign.d
+++ b/compiler/test/runnable/testassign.d
@@ -1,5 +1,5 @@
 /*
-REQUIRED_ARGS: -preview=rvaluerefparam
+REQUIRED_ARGS:
 TEST_OUTPUT:
 ---
 \	S1	S2a	S2b	S3a	S3b	S4a	S4b
diff --git a/compiler/test/runnable/xtest46.d b/compiler/test/runnable/xtest46.d
index cbcbd1a97f1a..71dec3b62f84 100644
--- a/compiler/test/runnable/xtest46.d
+++ b/compiler/test/runnable/xtest46.d
@@ -1,4 +1,4 @@
-// REQUIRED_ARGS: -preview=rvaluerefparam
+// REQUIRED_ARGS:
 //
 /* TEST_OUTPUT:
 ---
diff --git a/compiler/test/runnable/xtest46_gc.d b/compiler/test/runnable/xtest46_gc.d
index 38c136d531cd..b1a907e6c095 100644
--- a/compiler/test/runnable/xtest46_gc.d
+++ b/compiler/test/runnable/xtest46_gc.d
@@ -1,5 +1,5 @@
 /*
-REQUIRED_ARGS: -lowmem -Jrunnable -preview=rvaluerefparam
+REQUIRED_ARGS: -lowmem -Jrunnable
 EXTRA_FILES: xtest46.d
 TEST_OUTPUT:
 ---
diff --git a/druntime/test/stdcpp/src/string_test.d b/druntime/test/stdcpp/src/string_test.d
index dbbccc7cd6f6..4c14b555404a 100644
--- a/druntime/test/stdcpp/src/string_test.d
+++ b/druntime/test/stdcpp/src/string_test.d
@@ -19,11 +19,7 @@ unittest
     str = "Hello again with a long long string woo";
     assert(sumOfElements_val(str) == 10935);
     assert(sumOfElements_ref(str) == 3645);
-    //assert(str == std_string("Hello again with a long long string woo")); // Needs -preview=rvaluerefparam.
-    {
-        auto tmp = std_string("Hello again with a long long string woo");   // Workaround.
-        assert(str == tmp);
-    }
+    assert(str == std_string("Hello again with a long long string woo"));
 
     std_string str2 = std_string(Default);
     assert(str2.size == 0);