feat: throw exception if bridge is not found correctly

src/main/java/ftbsc/lll/processor/tools/ASTUtils.java

@@ -330,6 +330,31 @@ public class ASTUtils {
 		);
 	}
 
+	/**
+	 * Tries to find the "synthetic bridge" generated by the compiler for a certain overridden
+	 * method. A "bridge" only exists in cases where type erasure is involved (i.e. when the
+	 * method being overridden uses a generic parameter that is not preserved in the overriding
+	 * method).
+	 * @param context the {@link TypeElement} representing the parent class
+	 * @param method an {@link ExecutableElement} stub representing the overloading method
+	 * @param env the {@link ProcessingEnvironment} to perform the operation in
+	 * @return the "bridge"
+	 * @throws TargetNotFoundException if the method in question was not overriding anything, or
+	 * 																 if the method it was overriding does not require a bridge
+	 * @since 0.5.2
+	 */
+	public static ExecutableElement findSyntheticBridge(
+		TypeElement context, ExecutableElement method, ProcessingEnvironment env) throws TargetNotFoundException {
+		ExecutableElement overridding = findOverloadedMethod(context, method, env);
+		if(descriptorFromExecutableElement(overridding, env).equals(descriptorFromExecutableElement(method, env)))
+			throw new TargetNotFoundException(
+				"bridge method for",
+				overridding.getSimpleName().toString(),
+				context.getQualifiedName().toString()
+			);
+		else return overridding;
+	}
+
 	/**
 	 * Utility method for finding out what type of proxy a field is.
 	 * It will fail if the return type is not a known type of proxy.

src/main/java/ftbsc/lll/processor/tools/containers/MethodContainer.java

@@ -78,7 +78,7 @@ public class MethodContainer {
 			ExecutableElement tmp = (ExecutableElement) findMember(
 				parent, name, descriptor, descriptor != null && strict,false, env
 			);
-			this.elem = bridge ? findOverloadedMethod((TypeElement) this.parent.elem, tmp, env) : tmp;
+			this.elem = bridge ? findSyntheticBridge((TypeElement) this.parent.elem, tmp, env) : tmp;
 			this.name = this.elem.getSimpleName().toString();
 			this.descriptor = descriptorFromExecutableElement(this.elem, env);
 		}