[Bug c++/84587] [8 Regression] Local variable initializer goes out of scope since r247793

["marxin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84587

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #2)
> The testcase has undefined behavior; the initializer_list array only lives
> until the end of the initialization of 'a'.
> 
> 11.6.4p6: The array has the same lifetime as any other temporary object
> (15.2), except that initializing an initializer_list object from the array
> extends the lifetime of the array exactly like binding a reference to a
> temporary.
> 
> 15.2p6.9: A temporary object bound to a reference parameter in a function
> call (8.5.1.2) persists until the completion of the full-expression
> containing the call.
> 
> The code can be fixed by explicitly extending the initializer_list lifetime,
> e.g.
> 
>   std::initializer_list<const char> il = {'a', 'b', 'c'};
>   ArrayView<const char> a (il);

Thank you Jason for nice clarification ;)