[Bug fortran/77584] New: Unclassifiable statement error with procedure pointer using template named "structure_"

[abensonca at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77584

            Bug ID: 77584
           Summary: Unclassifiable statement error with procedure pointer
                    using template named "structure_"
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: abensonca at gmail dot com
  Target Milestone: ---

In gfortran 7.0.0 (r240119) the following causes an error on compilation:

module bug
  abstract interface
     double precision function structure_()
     end function structure_
  end interface
contains
  double precision function a()
    procedure(structure_), pointer :: b
  end function a
end module bug

$ gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/home/abenson/Galacticus/Tools/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/home/abenson/Galacticus/Tools
--enable-languages=c,c++,fortran --disable-multilib
Thread model: posix
gcc version 7.0.0 20160913 (experimental) (GCC) 

$ gfortran -c tmp.F90 -o tmp.o
tmp.F90:8:4:

     procedure(structure_), pointer :: b
    1
Error: Unclassifiable statement at (1)


The problem seems to occur only if the interface name begins with "structure",
so my guess is that this part of the name if being interpreted as a STRUCTURE
statement.