ahatanak marked an inline comment as done.
ahatanak added a comment.

In D55662#1349329 <https://reviews.llvm.org/D55662#1349329>, @rjmccall wrote:

> Oh, and please update the commit message to primarily talk about the changes 
> to placeholder checking.  You can discuss the impact on the 
> repeated-use-of-weak warning in a follow-up paragraph.


This patch has three parts:

1. Use the expression that was rewritten during auto type deduction to perform 
auto variable initialization.
2. Call `CheckPlaceholderExpr` while an unevaluated context is still on the 
stack.
3. Check whether we are in an unevaluated context before calling 
`recordUseOfWeak` in `Sema::BuildInstanceMessage`.

I think I should commit 1 separately from 2 and 3.



================
Comment at: lib/Sema/SemaLambda.cpp:793
+  else
+    Args = Init;
+
----------------
rjmccall wrote:
> Please maintain the original order here, even though I suspect it doesn't 
> matter: if this is direct-initialization, use the arguments, otherwise use 
> either `DeducedAutoInit` or `Init`.  Although really, consider just 
> reassigning `Init` immediately after the `deduceVarType...` call.
The code that assigns `CXXDirectInit`'s expressions to `Arg` is no longer 
needed since `Sema::deduceVarTypeFromInitializer` removes the `ParenListExpr`.

If we move the code that declares the `InitializedEntity` variable up, we can 
reassign `Init` immediately after the call to `deduceVarTypeFromInitializer`.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D55662/new/

https://reviews.llvm.org/D55662



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