fix arena

src/lily/alloc/arena.hb

@@ -10,11 +10,11 @@ ArenaAllocator := struct {
 	size: uint,
 	allocated: uint,
 
-	$new := fn(): Self {
-		allocated := 0
-					   allocated = Target.page_size()
-		ptr := Target.alloc_zeroed(allocated)
-		return .(ptr, allocated, 0)
+	new := fn(): Self {
+		size := Target.page_size()
+		// todo(?): spec should accept ?Self as return type
+		ptr := @unwrap(Target.alloc_zeroed(size))
+		return .(ptr, size, 0)
 	}
 	deinit := fn(self: ^Self): void {
 		match Target.current() {
@@ -55,4 +55,4 @@ ArenaAllocator := struct {
 		}
 		return null
 	}
-}
+}

src/test/lily/lily.alloc.arena.hb

@@ -5,8 +5,8 @@ lily := @use("../../lily/lib.hb")
 
 main := fn(argc: int, argv: [][]u8): u8 {
 	alloc := lily.alloc.ArenaAllocator.new()
+	defer alloc.deinit()
 	ptr_one := alloc.alloc(u8, 6)
 	ptr_two := alloc.alloc(u8, 179)
-	alloc.deinit()
 	return 0
-}
+}