[llvm-bugs] [Bug 48453] Assigning to non-active trivial union member is not accepted in constexpr context

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48453

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #1 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Per http://eel.is/c++draft/class.union#general-6, an assignment can only change
the active union member if the union member has a trivial default constructor.

`Un::NestedUn` has a non-trivial default constructor, so the union member
`Un::f2` cannot be made active by simply assigning to it or one of its
subobjects.

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