[Bug c++/65525] [5 Regression] ICE: sorry, unimplemented: unexpected AST of kind mem_ref (-std=c++14, ICE: in potential_constant_expression_1, at cp/constexpr.c:4432)

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65525

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED
                 CC|                            |jason at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> so I wonder why we look at the side-effects at all?  That is, why does
> COMPOUND_EXPR handling not return false on side-effects early?

Because a call to a constexpr function has TREE_SIDE_EFFECTS; we don't know
whether it's constant until we do the evaluation.