[llvm-bugs] [Bug 40475] New: Incorrect interaction of decltype with operator<<

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40475

            Bug ID: 40475
           Summary: Incorrect interaction of decltype with operator<<
           Product: clang
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: oliver.rosten at googlemail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

I'm running clang-1000.11.45.5 on my mac. To my bafflement, the following
snippet compiles and runs, producing "Hello, world!":

struct foo
{
};

decltype(std::stringstream{} << foo{}) f{"Hello, world!"};

//f << foo{};

std::cout << f.str() << '\n';

Reinstating the commented line does at least give the expected compilation
error since no appropriate operator<< exists.

As far as I can tell, the problem seems specific to mac.

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