Print a better error message when attempting to bridge from void to void (#35)

basil · web-flow · commit 9040c38992d3 · 2022-11-17T15:18:50.000-08:00
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
@@ -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;
