Added recursion support

src/macros.pre

@@ -1,7 +1,7 @@
 <?php
 
-macro {
-    (···parameters) => { ···body }
+macro ·recursion {
+    (···parameters) => {···body}
 } >> {
     call_user_func(function($context) {
         return function(···parameters) use ($context) {

tests/.gitignore

@@ -1 +1,2 @@
 Fixture.php
+nested.php

tests/MacroTest.php

@@ -4,6 +4,8 @@
 
 use PHPUnit\Framework\TestCase;
 
+use function Pre\process;
+
 class MacroTest extends TestCase
 {
     public function testShortClosures()
@@ -14,4 +16,15 @@ public function testShortClosures()
 
         $this->assertEquals("hello chris!", $cb("chris"));
     }
+
+    public function testNestedClosures()
+    {
+        $base = getenv("PRE_BASE_DIR");
+        $pre = __DIR__ . "/nested.pre";
+        $php = __DIR__ . "/nested.php";
+
+        process($base, $pre, $php);
+
+        $this->assertEquals("hello world", require $php);
+    }
 }

tests/nested.pre

@@ -0,0 +1,11 @@
+<?php
+
+$cb = () => {
+    return () => {
+        return () => {
+            return "hello world";
+        };
+    };
+};
+
+return $cb()()();