This one is a heisenbug, which showed up in the testsuite while testing a patch
but is also present on trunk:

$ cat proc_decl_2.f90 
program s
  implicit none
  procedure() :: q2
  procedure() :: q3
  procedure() :: q5
  procedure(sub) :: p4
  procedure(p4) :: p6
contains
  subroutine sub
  end subroutine
end program s
$ gfortran proc_decl_2.f90
proc_decl_2.f90:7.21:

  procedure(p4) :: p6
                    1
Error: Interface 'p4' of procedure 'p6' at (1) must be explicit


-- 
           Summary: Rejects valid procedure declarations
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fxcoudert at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33917

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