From dfa14910931b6395f215db5e781a48f4b6e3323b Mon Sep 17 00:00:00 2001
From: Celestino Amoroso <celestino.amoroso@gmail.com>
Date: Fri, 8 May 2026 10:10:28 +0200
Subject: [PATCH] kern/common-errors.go: new error function ErrFuncInvalidArg()

---
 kern/common-errors.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kern/common-errors.go b/kern/common-errors.go
index 5112e50..4859f04 100644
--- a/kern/common-errors.go
+++ b/kern/common-errors.go
@@ -84,6 +84,10 @@ func ErrUnknownVar(funcName, varName string) error {
 	return fmt.Errorf("%s(): unknown variable %q", funcName, varName)
 }
 
+func ErrFuncInvalidArg(funcName, details string) error {
+	return fmt.Errorf("%s(): invalid argument -- %s", funcName, details)
+}
+
 // --- Operator errors
 
 func ErrLeftOperandMustBeVariable(leftTerm, opTerm Term) error {