[llvm-bugs] [Bug 28039] New: Local classes must have an associated namespace since C++14

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28039

            Bug ID: 28039
           Summary: Local classes must have an associated namespace since
                    C++14
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: roman.perepelitsa at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Example:

  template <class T> void Bar(T t) { Foo(t); }
  template <class T> void Foo(T) {}

  void Test() {
    Bar([]{});
  }

Clang rejects this code (unexpected behaviour). Bar() should be found by ADL
when compiling with -std=c++14.

Clang's behaviour is correct prior to C++14.
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1690 has changed
the rules for associated namespaces starting with C++14.

For the record, the twin bug against GCC:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57433. GCC finds associated
namespaces according to the new rules. The bug is to make it use the old rules
when compiling with -std=c++11 and below.

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