Add support for initializing static variables with arbitrary expressions

Author: thekid

src/main/php/lang/ast/emit/PHP.class.php

@@ -185,8 +185,13 @@ protected function emitStatic($result, $static) {
     foreach ($static->initializations as $variable => $initial) {
       $result->out->write('static $'.$variable);
       if ($initial) {
-        $result->out->write('=');
-        $this->emitOne($result, $initial);
+        if ($this->staticScalar($initial)) {
+          $result->out->write('=');
+          $this->emitOne($result, $initial);
+        } else {
+          $result->out->write('= null; null === $'.$variable.' && $'.$variable.'= ');
+          $this->emitOne($result, $initial);
+        }
       }
       $result->out->write(';');
     }

src/test/php/lang/ast/unittest/emit/InitializeWithNewTest.class.php

@@ -103,4 +103,16 @@ public function run(Handle $h= new Handle(0)) {
     }');
     Assert::equals(new Handle(0), $r);
   }
+
+  #[Test]
+  public function static_variable() {
+    $r= $this->run('use lang\ast\unittest\emit\Handle; class <T> {
+      public function run() {
+        static $h= new Handle(0);
+
+        return $h;
+      }
+    }');
+    Assert::equals(new Handle(0), $r);
+  }
 }