fix(macro): allow multiple refs with self_

crates/macros/src/function.rs

@@ -196,7 +196,8 @@ impl<'a> Function<'a> {
     }
 
     fn build_returns(&self) -> Option<TokenStream> {
-        self.output.as_ref().map(|output| {
+        self.output.cloned().map(|mut output| {
+            output.drop_lifetimes();
             quote! {
                 .returns(
                     <#output as ::ext_php_rs::convert::IntoZval>::TYPE,

tests/src/integration/class/class.php

@@ -12,6 +12,8 @@
 assert($class->getString() === 'dolor et');
 $class->selfRef("foo");
 assert($class->getString() === 'Changed to foo');
+$class->selfMultiRef("bar");
+assert($class->getString() === 'Changed to bar');
 
 assert($class->getNumber() === 2022);
 $class->setNumber(2023);

tests/src/integration/class/mod.rs

@@ -49,6 +49,14 @@ impl TestClass {
         self_.string = format!("Changed to {val}");
         self_
     }
+
+    pub fn self_multi_ref<'a>(
+        self_: &'a mut ZendClassObject<TestClass>,
+        val: &str,
+    ) -> &'a mut ZendClassObject<TestClass> {
+        self_.string = format!("Changed to {val}");
+        self_
+    }
 }
 
 #[php_function]