'join' operator renamed as 'cat'

t_operator_test.go

@@ -75,11 +75,11 @@ func TestOperatorDigest(t *testing.T) {
 	runTestSuite(t, section, inputs)
 }
 
-func TestOperatorJoin(t *testing.T) {
-	section := "Operator-Join"
+func TestOperatorCat(t *testing.T) {
+	section := "Operator-Cat"
 	inputs := []inputType{
-		/*   1 */ {`["a","b"] join ["x"]`, kern.NewList([]any{"a", "b", "x"}), nil},
-		/*   2 */ {`["a","b"] join ["x"-true]`, nil, `[1:21] left operand 'x' [string] and right operand 'true' [bool] are not compatible with operator "-"`},
+		/*   1 */ {`["a","b"] cat ["x"]`, kern.NewList([]any{"a", "b", "x"}), nil},
+		/*   2 */ {`["a","b"] cat ["x"-true]`, nil, `[1:20] left operand 'x' [string] and right operand 'true' [bool] are not compatible with operator "-"`},
 	}
 
 	// runTestSuiteSpec(t, section, inputs, 2)