https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67617
--- Comment #5 from Daniel Krügler <daniel.kruegler at googlemail dot com> --- (In reply to Daniel Krügler from comment #3) > [..] I believe the wording for associative containers is not as clear as > it should be. For unordered containers 23.2.5 p11 speaks of "possibly const > value" for hasher and binary predicate, but in 23.2.4 p8 this additional > "possibly const" requirement is missing. I'm submitting an LWG issue for > this and provide the issue number once available. Please refer to LWG issue http://cplusplus.github.io/LWG/lwg-active.html#2542
