erik.pilkington added a reviewer: erik.pilkington.
erik.pilkington added inline comments.
Herald added a subscriber: dexonsmith.


================
Comment at: include/clang/AST/BuiltinTypes.def:265
+// a template.
+BUILTIN_TYPE(Recovery, RecoveryTy)
+
----------------
Why are you creating a new type as opposed to just using DependentTy (sorta 
like TypoExpr does)? It seems like if you want to recycle all the 
dependence-propagating code in Sema, then you need to fall back to DependentTy 
anyways, i.e. `1 + <recovery-expr>` will have dependent type with this patch, 
right?




================
Comment at: lib/Sema/SemaOverload.cpp:12248
+  SubExprs.append(Args.begin(), Args.end());
+  if (auto RE = RecoveryExpr::Create(
+             SemaRef.Context, chooseRecoveryType(*CandidateSet, Best),
----------------
Have you also considered handling this like delayed typos, where we try to 
TreeTransform into different possible recoveries later, in order to find out 
what the best fix is? You might be able to make a better guess as to what the 
right function to pick (or how to recover in general) is if you can see how the 
recovery would be used, but deciding here means you have a lot less information.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D61722/new/

https://reviews.llvm.org/D61722



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