From 9cb506ad971ce7b37fa80e8d58c579bcb2cc2342 Mon Sep 17 00:00:00 2001
From: Vern Paxson <vern@corelight.com>
Date: Mon, 4 Jan 2021 13:39:22 -0800
Subject: [PATCH] simple error propagation fix: don't complain about "unused"
 values that themselves are due to errors

---
 src/Stmt.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Stmt.cc b/src/Stmt.cc
index d2b554f439..87860c4ebe 100644
--- a/src/Stmt.cc
+++ b/src/Stmt.cc
@@ -311,7 +311,7 @@ ValPtr PrintStmt::DoExec(std::vector<ValPtr> vals,
 
 ExprStmt::ExprStmt(ExprPtr arg_e) : Stmt(STMT_EXPR), e(std::move(arg_e))
 	{
-	if ( e && e->IsPure() )
+	if ( e && e->IsPure() && e->GetType()->Tag() != TYPE_ERROR )
 		Warn("expression value ignored");
 
 	SetLocationInfo(e->GetLocationInfo());