From 0a1b43247133d1cfe8dd507017f3bdc63e6f96da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <chfast@gmail.com>
Date: Thu, 1 Oct 2020 14:14:05 +0200
Subject: [PATCH] Drop call arguments _after_ the call

---
 lib/fizzy/execute.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/fizzy/execute.cpp b/lib/fizzy/execute.cpp
index e540cf777..4b985fdf7 100644
--- a/lib/fizzy/execute.cpp
+++ b/lib/fizzy/execute.cpp
@@ -58,16 +58,14 @@ inline bool invoke_function(
 {
     assert(stack.size() >= num_args);
     span<const Value> call_args{stack.rend() - num_args, num_args};
-    stack.drop(num_args);
 
     const auto ret = func(instance, call_args, depth + 1);
-    // Bubble up traps
     if (ret.trapped)
-        return false;
+        return false;  // Bubble up traps
 
-    // Push back the result
+    stack.drop(num_args);
     if (ret.has_value)
-        stack.push(ret.value);
+        stack.push(ret.value);  // Push back the result
 
     return true;
 }