[Bug c++/89158] [8/9 Regression] by-value capture of ICE variable isn't an lvalue?

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89158

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
When reference_binding creates the conversion const int -> const int & the
expression is still VIEW_CONVERT_EXPR<const int>(Val) so it doesn't set
conv->need_temporary_p.  Only then do we call mark_rvalue_use which turns it
into NON_LVALUE_EXPR<42>.