[PATCH] Avoid std::function until PR19030 is fixed

[Reid Kleckner]

We'd like to keep the clang-cl self-host working until we implement
MSVC-compatible RTTI.

http://llvm-reviews.chandlerc.com/D2930

Files:
  docs/CodingStandards.rst

Index: docs/CodingStandards.rst
===================================================================
--- docs/CodingStandards.rst
+++ docs/CodingStandards.rst
@@ -753,6 +753,17 @@
   // Remove the reference if you really want a new copy.
   for (auto Val : Container) { Val.change(); saveSomewhere(Val); }
 
+Do not use std::function
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Using ``std::function`` breaks self-hosting Clang on Windows with the Microsoft
+Visual C++ STL.  MSVC's implementation of ``std::function`` requires RTTI, and
+Clang does not implement `MSVC-compatible RTTI`_ yet.  Generally, any local use
+of ``std::function`` can be replaced with ``auto``.  For code that truly needs
+an opaque function, use something else for the meantime.
+
+.. _MSVC-style RTTI: http://llvm.org/PR18951
+
 Style Issues
 ============
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