[Bug c/68533] New: bogus location for "warning: ‘struct s3’ declared inside parameter list will not be visible outside of this definition or declaration"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68533

            Bug ID: 68533
           Summary: bogus location for "warning: ‘struct s3’ declared
                    inside parameter list will not be visible outside of
                    this definition or declaration"
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

> ./cc1 -quiet t.c -O3 -fdump-tree-slp-details
t.c:18:29: warning: ‘struct s3’ declared inside parameter list will not be
visible outside of this definition or declaration
 foo (struct s3 *arg, struct s4 *arg1)
                             ^~


for the testcase in PR68517