saar.raz added inline comments.

================
Comment at: lib/AST/ExprCXX.cpp:1478
+  {
+    // We do not want error diagnostics escaping here.
+    Sema::SFINAETrap Trap(S);
----------------
faisalv wrote:
> Hubert: This needs a TODO: the idea is not to drop SFINAE errors, but to 
> avoid instantiation that may trigger errors not in the immediate context of 
> instantiation. The substitution needs to happen piecewise.
Could you elaborate/give an example where this handling is inappropriate?


Repository:
  rC Clang

https://reviews.llvm.org/D41217



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