zend_language_parser: Backup / restore doc comment when parsing attributes

Zend/zend_language_parser.y

@@ -379,7 +379,7 @@ attribute_group:
 ;
 
 attribute:
-		T_ATTRIBUTE attribute_group possible_comma ']'	{ $$ = $2; }
+		T_ATTRIBUTE backup_doc_comment attribute_group possible_comma ']'	{ $$ = $3; CG(doc_comment) = $2; }
 ;
 
 attributes:

ext/reflection/tests/gh20895.phpt

@@ -0,0 +1,108 @@
+--TEST--
+GH-20895: ReflectionProperty does not return the PHPDoc of a property if it contains an attribute with a Closure
+--FILE--
+<?php
+
+/** Foo */
+#[Attr(
+    /** Closure 1 */
+    static function() { },
+    /** Closure 2 */
+    static function() { },
+)]
+class Foo {
+    /** Foo::$bar */
+    #[Attr(
+        /** Closure 3 */
+        static function() { },
+        /** Closure 4 */
+        static function() { },
+    )]
+    #[Attr(
+        /** Closure 5 */
+        static function() { },
+    )]
+    public $bar;
+
+    /** Foo::bar() */
+    #[Attr(
+        /** Closure 6 */
+        static function() { },
+    )]
+    public function bar() { }
+}
+
+/** foo() */
+#[Attr(
+    /** Closure 7 */
+    static function() { },
+)]
+function foo() { }
+
+#[Attr(
+    /** Closure 8 */
+    static function() { },
+)]
+/** bar() */
+function bar() { }
+
+/** baz() */
+#[Attr(
+    static function() { },
+)]
+function baz() { }
+
+var_dump((new ReflectionClass(Foo::class))->getDocComment());
+foreach ((new ReflectionClass(Foo::class))->getAttributes() as $attribute) {
+    foreach ($attribute->getArguments() as $argument) {
+        var_dump((new ReflectionFunction($argument))->getDocComment());
+    }
+}
+var_dump((new ReflectionProperty(Foo::class, 'bar'))->getDocComment());
+foreach ((new ReflectionProperty(Foo::class, 'bar'))->getAttributes() as $attribute) {
+    foreach ($attribute->getArguments() as $argument) {
+        var_dump((new ReflectionFunction($argument))->getDocComment());
+    }
+}
+var_dump((new ReflectionMethod(Foo::class, 'bar'))->getDocComment());
+foreach ((new ReflectionMethod(Foo::class, 'bar'))->getAttributes() as $attribute) {
+    foreach ($attribute->getArguments() as $argument) {
+        var_dump((new ReflectionFunction($argument))->getDocComment());
+    }
+}
+var_dump((new ReflectionFunction('foo'))->getDocComment());
+foreach ((new ReflectionFunction('foo'))->getAttributes() as $attribute) {
+    foreach ($attribute->getArguments() as $argument) {
+        var_dump((new ReflectionFunction($argument))->getDocComment());
+    }
+}
+var_dump((new ReflectionFunction('bar'))->getDocComment());
+foreach ((new ReflectionFunction('bar'))->getAttributes() as $attribute) {
+    foreach ($attribute->getArguments() as $argument) {
+        var_dump((new ReflectionFunction($argument))->getDocComment());
+    }
+}
+var_dump((new ReflectionFunction('baz'))->getDocComment());
+foreach ((new ReflectionFunction('baz'))->getAttributes() as $attribute) {
+    foreach ($attribute->getArguments() as $argument) {
+        var_dump((new ReflectionFunction($argument))->getDocComment());
+    }
+}
+
+?>
+--EXPECT--
+string(10) "/** Foo */"
+string(16) "/** Closure 1 */"
+string(16) "/** Closure 2 */"
+string(16) "/** Foo::$bar */"
+string(16) "/** Closure 3 */"
+string(16) "/** Closure 4 */"
+string(16) "/** Closure 5 */"
+string(17) "/** Foo::bar() */"
+string(16) "/** Closure 6 */"
+string(12) "/** foo() */"
+string(16) "/** Closure 7 */"
+string(12) "/** bar() */"
+string(16) "/** Closure 8 */"
+string(12) "/** baz() */"
+bool(false)