diff --git a/src/main/java/de/tla2b/analysis/InstanceTransformation.java b/src/main/java/de/tla2b/analysis/InstanceTransformation.java index 50e5c18b648d92f721f15a27a23f265a20337e13..018576f193cf248acc7f9769865a39a856ba18cb 100644 --- a/src/main/java/de/tla2b/analysis/InstanceTransformation.java +++ b/src/main/java/de/tla2b/analysis/InstanceTransformation.java @@ -162,7 +162,7 @@ public class InstanceTransformation extends BuiltInOPs implements ASTConstants { String opName = prefix + n.getOperator().getName().toString(); OpDefNode op = defs.get(opName); if (op == null) { - throw new RuntimeException(); + throw new RuntimeException("user-defined operator " + opName + " not found"); } return createOpApplNode(op, copyArgs(n.getArgs(), prefix), n.getTreeNode()); }