operator-index.go: dict item access by generic keys implemented

operator-index.go

@@ -113,6 +113,16 @@ func evalIndex(ctx ExprContext, self *term) (v any, err error) {
 		default:
 			err = self.errIncompatibleTypes(leftValue, rightValue)
 		}
+	} else if IsDict(leftValue) {
+		var ok bool
+		var indexValue any
+		d := leftValue.(*DictType)
+		if indexValue, err = verifyKey(indexTerm, indexList); err == nil {
+			if v, ok = (*d)[indexValue]; !ok {
+				err = indexTerm.Errorf("key %v does not belong to the dictionary", rightValue)
+			}
+		}
+	
 	}
 	return
 }