Program: 58386
Project: 58386
Buggy source:
static boolean substitute(ClassNode cn){
  boolean altered=false;
  if (cn.methods != null) {
    Iterator<MethodNode> iter=cn.methods.iterator();
    while (iter.hasNext()) {
      MethodNode mn=iter.next();
      if (mn.visibleAnnotations != null) {
        for (        AnnotationNode node : mn.visibleAnnotations) {
          AnnotationInfo info=parseAnnotation(node,substitutableDesc);
          if (checkSub(info,mn)) {
            altered=true;
            mn.instructions.clear();
            mn.localVariables=null;
            l: {
              for (              MethodNode m : cn.methods) {
                if (info.method.equals(m.name) && mn.desc.equals(m.desc)) {
                  mn.instructions.add(m.instructions);
                  break l;
                }
              }
              Type rType=Type.getReturnType(mn.desc);
switch (rType.getSort()) {
case Type.METHOD:
case Type.ARRAY:
case Type.OBJECT:
                mn.instructions.add(new InsnNode(ACONST_NULL));
              break;
case Type.FLOAT:
            mn.instructions.add(new InsnNode(FCONST_0));
          break;
case Type.DOUBLE:
        mn.instructions.add(new InsnNode(DCONST_0));
      break;
case Type.LONG:
    mn.instructions.add(new InsnNode(LCONST_0));
  break;
default :
mn.instructions.add(new InsnNode(ICONST_0));
switch (rType.getSort()) {
case Type.SHORT:
mn.instructions.add(new InsnNode(I2S));
break;
case Type.CHAR:
mn.instructions.add(new InsnNode(I2C));
break;
case Type.BYTE:
mn.instructions.add(new InsnNode(I2B));
break;
}
break;
case Type.VOID:
break;
}
mn.instructions.add(new InsnNode(rType.getOpcode(IRETURN)));
}
}
}
}
}
}
return altered;
}

Fixed version (ground truth):
static boolean substitute(ClassNode cn){
  boolean altered=false;
  if (cn.methods != null) {
    Iterator<MethodNode> iter=cn.methods.iterator();
    while (iter.hasNext()) {
      MethodNode mn=iter.next();
      if (mn.visibleAnnotations != null) {
        for (        AnnotationNode node : mn.visibleAnnotations) {
          AnnotationInfo info=parseAnnotation(node,substitutableDesc);
          if (checkSub(info,mn)) {
            altered=true;
            mn.instructions.clear();
            mn.localVariables=null;
            l: {
              for (              MethodNode m : cn.methods) {
                if (info.method.equals(m.name) && mn.desc.equals(m.desc)) {
                  mn.instructions.add(cloneList(m.instructions));
                  break l;
                }
              }
              Type rType=Type.getReturnType(mn.desc);
switch (rType.getSort()) {
case Type.METHOD:
case Type.ARRAY:
case Type.OBJECT:
                mn.instructions.add(new InsnNode(ACONST_NULL));
              break;
case Type.FLOAT:
            mn.instructions.add(new InsnNode(FCONST_0));
          break;
case Type.DOUBLE:
        mn.instructions.add(new InsnNode(DCONST_0));
      break;
case Type.LONG:
    mn.instructions.add(new InsnNode(LCONST_0));
  break;
default :
mn.instructions.add(new InsnNode(ICONST_0));
switch (rType.getSort()) {
case Type.SHORT:
mn.instructions.add(new InsnNode(I2S));
break;
case Type.CHAR:
mn.instructions.add(new InsnNode(I2C));
break;
case Type.BYTE:
mn.instructions.add(new InsnNode(I2B));
break;
}
break;
case Type.VOID:
break;
}
mn.instructions.add(new InsnNode(rType.getOpcode(IRETURN)));
}
}
}
}
}
}
return altered;
}