[Errata corrige]
Hello everyone.
I'm getting an error when importing msh files in deal.II with 
GridIn::read_msh().

For the sake of simplicity I brought a very basic grid:
- Rectangle 2x1
- Divided in two squares 1x1, both uniformly meshed, transfinite, with 
different granularity

When I import it in deal.II with:
const std::string filename = "mesh.msh";
std::ifstream input_file(filename);
Triangulation<2> triangulation;
GridIn<2> grid_in;
grid_in.attach_triangulation(triangulation);
grid_in.read_msh(input_file);

I experience this error:

terminate called after throwing an instance of 
'dealii::StandardExceptions::ExcMessage'
  what():  
--------------------------------------------------------
An error occurred in line <2594> of file 
</usr/src/dealii-v9.5.0/source/grid/tria.cc> in function
    static void 
dealii::internal::TriangulationImplementation::Implementation::process_subcelldata(const
 
dealii::internal::TriangulationImplementation::CRS<T>&, 
dealii::internal::TriangulationImplementation::TriaObjects&, const 
std::vector<dealii::CellData<dim> >&, const 
std::vector<dealii::Point<spacedim> >&) [with int structdim = 1; int 
spacedim = 2; T = unsigned int]
The violated condition was: 
    boundary_id != numbers::internal_face_boundary_id
Additional information: 
    The input arguments for creating a triangulation specified a boundary
    id for an internal face. This is not allowed.
    
    The object in question has vertex indices 1,40, which are located at
    positions (1 0)(1 0.25).

Of course, I defined as physical curves only two edges at the boundary.

Can anybody help me to fix the issue please?
I attach the simple script to reproduce the error, together with the .geo 
and .msh files, as well as the CMakeLists to compile the code.

Thanks in advance.



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