From a11d3bcdb544b5d8d0341d549f944dce9f5319e0 Mon Sep 17 00:00:00 2001
From: Nick Treleaven <n@trelsoft.com>
Date: Wed, 23 May 2018 11:47:02 +0100
Subject: [PATCH] Don't allocate argument mismatch string when errors gagged

---
 src/dmd/mtype.d | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/dmd/mtype.d b/src/dmd/mtype.d
index f5c51902ce9a..31a5498cf9c1 100644
--- a/src/dmd/mtype.d
+++ b/src/dmd/mtype.d
@@ -4782,6 +4782,8 @@ extern (C++) final class TypeFunction : TypeNext
     // arguments get specially formatted
     private const(char)* getParamError(const(char)* format, Expression arg, Parameter par)
     {
+        if (global.gag && !global.params.showGaggedErrors)
+            return null;
         // show qualification when toChars() is the same but types are different
         auto at = arg.type.toChars();
         bool qual = !arg.type.equals(par.type) && strcmp(at, par.type.toChars()) == 0;