From 577376d181a06ae2d053b503b95e5d7ea571c638 Mon Sep 17 00:00:00 2001
From: Thomas Lively <tlively@google.com>
Date: Thu, 13 Oct 2022 15:35:18 -0500
Subject: [NFC] Add an explicit deduction guide for `WithPosition` (#5140)

Since our usage of `WithPosition` depends on C++17 class template argument
deduction, it triggers a clang warning `-Wctad-maybe-unsupported`. Silence the
warning by providing an explicit deduction guide.
---
 src/wasm/wat-parser.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/wasm/wat-parser.cpp')

diff --git a/src/wasm/wat-parser.cpp b/src/wasm/wat-parser.cpp
index bba751c71..23961ac3f 100644
--- a/src/wasm/wat-parser.cpp
+++ b/src/wasm/wat-parser.cpp
@@ -325,6 +325,9 @@ template<typename Ctx> struct WithPosition {
   ~WithPosition() { ctx.in.lexer.setIndex(original); }
 };
 
+// Deduction guide to satisfy -Wctad-maybe-unsupported.
+template<typename Ctx> WithPosition(Ctx& ctx, Index) -> WithPosition<Ctx>;
+
 using IndexMap = std::unordered_map<Name, Index>;
 
 void applyImportNames(Importable& item,
-- 
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