From 9040c38992d36e5955c647c9831dc0e19d7b154e Mon Sep 17 00:00:00 2001
From: Basil Crow <me@basilcrow.com>
Date: Thu, 17 Nov 2022 15:18:50 -0800
Subject: [PATCH] Print a better error message when attempting to bridge from
 void to void (#35)

---
 .../infradna/tool/bridge_method_injector/MethodInjector.java    | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/injector/src/main/java/com/infradna/tool/bridge_method_injector/MethodInjector.java b/injector/src/main/java/com/infradna/tool/bridge_method_injector/MethodInjector.java
index de33f77..de24970 100644
--- a/injector/src/main/java/com/infradna/tool/bridge_method_injector/MethodInjector.java
+++ b/injector/src/main/java/com/infradna/tool/bridge_method_injector/MethodInjector.java
@@ -231,6 +231,8 @@ public void inject(ClassVisitor cv) {
                     if (returnType.equals(Type.VOID_TYPE) || returnType.getClassName().equals("java.lang.Void")) {
                         // bridge to void, which means disregard the return value from the original method
                         switch (originalReturnType.getSize()) {
+                        case 0:
+                            throw new IllegalArgumentException("Cannot bridge " + name + " from void to void; did you mean to use a different type?");
                         case 1:
                             mv.visitInsn(POP);
                             break;