Index: clang/lib/Sema/SemaLambda.cpp
===================================================================
--- clang/lib/Sema/SemaLambda.cpp
+++ clang/lib/Sema/SemaLambda.cpp
@@ -1227,9 +1227,7 @@
   FunctionProtoType::ExtProtoInfo ConvExtInfo(
       S.Context.getDefaultCallingConvention(
       /*IsVariadic=*/false, /*IsCXXMethod=*/true));
-  // The conversion function is always const.
-  // C++17 also obliges it to be noexcept (which it in fact is),
-  // and previous standards don't forbid that either.
+  // The conversion function is always const and noexcept.
   ConvExtInfo.TypeQuals = Qualifiers();
   ConvExtInfo.TypeQuals.addConst();
   ConvExtInfo.ExceptionSpec.Type = EST_BasicNoexcept;