[LLVMbugs] [Bug 22838] Error about incomplete field is issued for inner typedef in incomplete class, but not for incomplete class itself

[bugzilla-daemon at llvm.org]

https:llvm.org/bugs/show_bug.cgi?id=22838

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk
         Resolution|---                         |INVALID

--- Comment #4 from Richard Smith <richard-llvm at metafoo.co.uk> ---
C++ [res.on.functions](17.6.4.8)p2 says this about templates defined in the
standard library:

"In particular, the effects are undefined in the following cases:
[...]
-- if an incomplete type (3.9) is used as a template argument when
instantiating a template component, unless specifically allowed for that
component."


In any case, you've not presented evidence indicating a Clang bug. You could
try asking whoever wrote your standard library if they're prepared to allow
your code as an extension.

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