From 4c830cdbd5993883f671e17228afc39c3a21e5cc Mon Sep 17 00:00:00 2001
From: Li Jin <dragon-fly@qq.com>
Date: Mon, 13 Jan 2020 14:19:33 +0800
Subject: forbid exprlist appears in the left part of update statement.

---
 src/MoonP/moon_compiler.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/MoonP/moon_compiler.cpp b/src/MoonP/moon_compiler.cpp
index e015939..0a5babe 100644
--- a/src/MoonP/moon_compiler.cpp
+++ b/src/MoonP/moon_compiler.cpp
@@ -1239,6 +1239,7 @@ private:
 		auto action = assignment->action.get();
 		switch (action->getId()) {
 			case "Update"_id: {
+				if (expList->exprs.size() > 1) throw std::logic_error(debugInfo("Can not apply update to multiple values."sv, expList));
 				auto update = static_cast<Update_t*>(action);
 				auto leftExp = static_cast<Exp_t*>(expList->exprs.objects().front());
 				auto leftValue = singleValueFrom(leftExp);
-- 
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