[Bug libstdc++/59530] New: Incorrect check on string_view operator[]

[bigotp at acm dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59530

            Bug ID: 59530
           Summary: Incorrect check on string_view operator[]
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bigotp at acm dot org

Created attachment 31449
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31449&action=edit
Patch and test update

Per http://isocpp.org/files/papers/N3762.html#string.view.ops, string_view's
operator[](size()) is undefined, unlike basic_string_view.