diff --git a/Zend/tests/ast/gh21072.phpt b/Zend/tests/ast/gh21072.phpt
new file mode 100644
index 000000000000..1ffd0518eaea
--- /dev/null
+++ b/Zend/tests/ast/gh21072.phpt
@@ -0,0 +1,17 @@
+--TEST--
+(unset) cast must not be allowed in constant expressions
+--CREDITS--
+Viet Hoang Luu (@vi3tL0u1s)
+--FILE--
+<?php
+try {
+    class C {
+        public $p = (unset) C::class;
+    }
+    new C;
+} catch (Error $e) {
+    echo $e->getMessage();
+}
+?>
+--EXPECTF--
+Fatal error: The (unset) cast is no longer supported in %s on line %d
diff --git a/Zend/zend_ast.c b/Zend/zend_ast.c
index cd8e6792d031..764cac3f12af 100644
--- a/Zend/zend_ast.c
+++ b/Zend/zend_ast.c
@@ -1247,6 +1247,12 @@ static zend_result ZEND_FASTCALL zend_ast_evaluate_inner(
 		}
 		case ZEND_AST_OP_ARRAY:
 		{
+			// Preloading will attempt to resolve constants but objects can't be stored in shm
+			// Aborting here to store the const AST instead
+			if (CG(in_compilation)) {
+				return FAILURE;
+			}
+
 			zend_function *func = (zend_function *)zend_ast_get_op_array(ast)->op_array;
 
 			zend_create_closure(result, func, scope, scope, NULL);
diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 1ce921d4fec2..fb04387a0045 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -12564,6 +12564,9 @@ static void zend_eval_const_expr(zend_ast **ast_ptr) /* {{{ */
 			zend_eval_const_expr(&ast->child[1]);
 			return;
 		case ZEND_AST_CAST:
+			if (ast->attr == IS_NULL) {
+				zend_error_noreturn(E_COMPILE_ERROR, "The (unset) cast is no longer supported");
+			}
 			zend_eval_const_expr(&ast->child[0]);
 			if (ast->child[0]->kind == ZEND_AST_ZVAL
 			 && zend_try_ct_eval_cast(&result, ast->attr, zend_ast_get_zval(ast->child[0]))) {
diff --git a/build/gen_stub.php b/build/gen_stub.php
index 9cd9b9a18768..2670e85458db 100755
--- a/build/gen_stub.php
+++ b/build/gen_stub.php
@@ -2235,7 +2235,7 @@ public function __clone()
 
 class EvaluatedValue
 {
-    public /* readonly */ mixed $value;
+    public /* readonly */ /* mixed */ $value;
     public SimpleType $type;
     public Expr $expr;
     public bool $isUnknownConstValue;
diff --git a/ext/date/php_date.c b/ext/date/php_date.c
index 8f98589b2b47..e462b70d2cff 100644
--- a/ext/date/php_date.c
+++ b/ext/date/php_date.c
@@ -370,9 +370,7 @@ static int date_object_compare_timezone(zval *tz1, zval *tz2);
 
 /* {{{ Module struct */
 zend_module_entry date_module_entry = {
-	STANDARD_MODULE_HEADER_EX,
-	NULL,
-	NULL,
+	STANDARD_MODULE_HEADER,
 	"date",                     /* extension name */
 	ext_functions,              /* function list */
 	PHP_MINIT(date),            /* process startup */
diff --git a/ext/opcache/tests/preload_gh21059.inc b/ext/opcache/tests/preload_gh21059.inc
new file mode 100644
index 000000000000..8f93bb45020b
--- /dev/null
+++ b/ext/opcache/tests/preload_gh21059.inc
@@ -0,0 +1,7 @@
+<?php
+
+class Foo {
+    public const C = static function() {
+        echo "Hello world\n";
+    };
+}
diff --git a/ext/opcache/tests/preload_gh21059.phpt b/ext/opcache/tests/preload_gh21059.phpt
new file mode 100644
index 000000000000..39e7aceae942
--- /dev/null
+++ b/ext/opcache/tests/preload_gh21059.phpt
@@ -0,0 +1,18 @@
+--TEST--
+GH-21059: Segfault when preloading constant AST closure
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.preload={PWD}/preload_gh21059.inc
+--EXTENSIONS--
+opcache
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');
+?>
+--FILE--
+<?php
+(Foo::C)();
+?>
+--EXPECT--
+Hello world