From 98ebe5f4ce6d270dda5fdb5a053f74ab483f0b06 Mon Sep 17 00:00:00 2001
From: Richard Elkins <richard.elkins@gmail.com>
Date: Tue, 5 May 2026 10:14:56 -0500
Subject: [PATCH] JACOBIN-896 jj._panic: force a Go runtime panic

---
 src/gfunction/misc/jj.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/gfunction/misc/jj.go b/src/gfunction/misc/jj.go
index a7088c48..85229817 100644
--- a/src/gfunction/misc/jj.go
+++ b/src/gfunction/misc/jj.go
@@ -68,6 +68,12 @@ func Load_jj() {
 			ParamSlots: 0,
 			GFunction:  jjGetProgramName,
 		}
+
+	ghelpers.MethodSignatures["jj._panic()V"] =
+		ghelpers.GMeth{
+			ParamSlots: 0,
+			GFunction:  jjPanic,
+		}
 }
 
 func jjStringifyScalar(ftype string, fvalue any) *object.Object {
@@ -376,3 +382,11 @@ func jjGetProgramName([]interface{}) interface{} {
 	str := glob.JacobinName
 	return object.StringObjectFromGoString(str)
 }
+
+func jjPanic([]interface{}) interface{} {
+	trace.Warning("jjPanic: Will cause a Go runtime divide by zero panic")
+	var zero = 0
+	zero = 1 / zero
+	errMsg := "jjPanic: What??? No splash???"
+	return ghelpers.GetGErrBlk(excNames.VirtualMachineError, errMsg)
+}