[Bug 215969] c++ compiler regression

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215969

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Tue Mar  7 21:44:05 UTC 2017
New revision: 314883
URL: https://svnweb.freebsd.org/changeset/base/314883

Log:
  Pull in r291403 from upstream clang trunk (by Richard Smith):

    PR30305: Implement proposed DR resolution to prevent slicing via
    inherited constructor.

    The rule we use is that a construction of a class type T from an
    argument of type U cannot use an inherited constructor if U is the
    same as T or is derived from T (or if the initialization would first
    convert it to such a type). This (approximately) matches the rule in
    use by GCC, and matches the current proposed DR resolution.

  Pull in r291955 from upstream clang trunk (by Richard Smith):

    PR31606: Generalize our tentative DR resolution for inheriting
    copy/move constructors to better match the pre-P0136R1 behavior.

  Together, these fix an issue with C++ using declarations sometimes
  enabling illegal implicit casts.

  Direct commit to stable/11, since head already has clang 4.0.0, which
  includes this change.

  Reported by:  kami
  PR:           215969

Changes:
  stable/11/contrib/llvm/tools/clang/include/clang/Basic/DiagnosticSemaKinds.td
  stable/11/contrib/llvm/tools/clang/include/clang/Sema/Overload.h
  stable/11/contrib/llvm/tools/clang/lib/Sema/SemaOverload.cpp

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