From ba8810e5df31a8d418ccb426c51be03ef2120743 Mon Sep 17 00:00:00 2001
From: Daniel Holle <dholle@hb.dhbw-stuttgart.de>
Date: Fri, 19 Jul 2024 18:04:33 +0200
Subject: [PATCH] I don't know why isFunctionalInterface returns true on things
 that aren't even interfaces but here we go

---
 src/main/java/de/dhbwstuttgart/bytecode/Codegen.java | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java b/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
index 77d1460c..d5b11caa 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
@@ -305,8 +305,11 @@ public class Codegen {
 
     private boolean isFunctionalInterface(TargetType type) {
         if (type instanceof TargetFunNType) return true;
-        if (type instanceof TargetRefType)
-            return compiler.getClass(new JavaClassName(type.name())).isFunctionalInterface();
+        if (type instanceof TargetRefType) {
+            var clazz = compiler.getClass(new JavaClassName(type.name()));
+            return (clazz.getModifiers() & Modifier.INTERFACE) != 0 && clazz.isFunctionalInterface();
+        }
+
         return false;
     }