Don't implicitly make closures in static methods static

It makes no sense that you can't write a closure using $this in a
static method, even though you can write one outside a class.

Now only closures that have been marked as static will be considered
to be static.

Fixes bug #65598.

Zend/tests/closure_041.phpt

@@ -49,7 +49,7 @@ $d = $staticUnscoped->bindTo(null); $d(); echo "\n";
 $d = $nonstaticUnscoped->bindTo(null); $d(); echo "\n";
 $d = $staticScoped->bindTo(null); $d(); echo "\n";
 $d = $nonstaticScoped->bindTo(null); $d(); echo "\n";
-//$d should have been turned to static
+// $d is still non-static
 $d->bindTo($d);
 
 echo "After binding, with same-class instance for the bound ones", "\n";
@@ -83,8 +83,6 @@ scoped to A: bool(true)
 bound: no
 scoped to A: bool(true)
 bound: no
-
-Warning: Cannot bind an instance to a static closure in %s on line %d
 After binding, with same-class instance for the bound ones
 
 Warning: Cannot bind an instance to a static closure in %s on line %d
@@ -103,4 +101,4 @@ scoped to A: bool(false)
 bound: B (should be scoped to dummy class)
 scoped to A: bool(true)
 bound: B
-Done.
+Done.

Zend/tests/closure_045.phpt

@@ -1,12 +1,12 @@
 --TEST--
-Closure 045: Closures created in static methods are static, even without the keyword
+Closure 045: Closures created in static methods are not implicitly static
 --FILE--
 <?php
 
 class A {
-static function foo() {
-	return function () {};
-}
+    static function foo() {
+        return function () {};
+    }
 }
 
 $a = A::foo();
@@ -15,5 +15,4 @@ $a->bindTo(new A);
 echo "Done.\n";
 
 --EXPECTF--
-Warning: Cannot bind an instance to a static closure in %s on line %d
 Done.

Zend/tests/closure_046.phpt

@@ -27,7 +27,7 @@ $nonstaticScoped(); echo "\n";
 echo "After binding, no instance", "\n";
 $d = $nonstaticUnscoped->bindTo(null, "static"); $d(); echo "\n";
 $d = $nonstaticScoped->bindTo(null, "static"); $d(); echo "\n";
-//$d should have been turned to static
+// $d is still non-static
 $d->bindTo($d);
 
 echo "After binding, with same-class instance for the bound one", "\n";
@@ -54,8 +54,6 @@ bool(false)
 bool(true)
 bool(false)
 
-
-Warning: Cannot bind an instance to a static closure in %s on line %d
 After binding, with same-class instance for the bound one
 bool(false)
 bool(true)

Zend/zend_closures.c

@@ -513,17 +513,14 @@ ZEND_API void zend_create_closure(zval *res, zend_function *func, zend_class_ent
 	}
 
 	ZVAL_UNDEF(&closure->this_ptr);
-	/* Invariants:
-	 * If the closure is unscoped, it has no bound object.
-	 * The the closure is scoped, it's either static or it's bound */
+	/* Invariant:
+	 * If the closure is unscoped or static, it has no bound object. */
 	closure->func.common.scope = scope;
 	closure->called_scope = called_scope;
 	if (scope) {
 		closure->func.common.fn_flags |= ZEND_ACC_PUBLIC;
 		if (this_ptr && Z_TYPE_P(this_ptr) == IS_OBJECT && (closure->func.common.fn_flags & ZEND_ACC_STATIC) == 0) {
 			ZVAL_COPY(&closure->this_ptr, this_ptr);
-		} else {
-			closure->func.common.fn_flags |= ZEND_ACC_STATIC;
 		}
 	}
 }