self param replaced as opTerm

operator-plugin.go

@@ -20,11 +20,11 @@ func newPluginTerm(tk *Token) (inst *term) {
 	}
 }
 
-func evalPlugin(ctx ExprContext, self *term) (v any, err error) {
+func evalPlugin(ctx ExprContext, opTerm *term) (v any, err error) {
 	var childValue any
 	var moduleSpec any
 
-	if childValue, err = self.evalPrefix(ctx); err != nil {
+	if childValue, err = opTerm.evalPrefix(ctx); err != nil {
 		return
 	}
 
@@ -38,7 +38,7 @@ func evalPlugin(ctx ExprContext, self *term) (v any, err error) {
 			}
 			count++
 		} else {
-			err = self.Errorf("expected string as item nr %d, got %s", it.Index()+1, TypeName(moduleSpec))
+			err = opTerm.Errorf("expected string as item nr %d, got %s", it.Index()+1, TypeName(moduleSpec))
 			break
 		}
 	}