Parsing error when a generic binding references a parent's private binding

[rouson]

The transcript below reproduces an error that occurs when ford attempts to parse a derived type that defines a generic binding corresponding to a parent type's private binding:

> cat ford.md 
project: Formal
src_dir: .
preprocess: false

> cat tensors_1D_m.f90 
module tensors_1D_m
  implicit none

  type tensor_1D_t
  contains
    procedure, private :: gradient_1D_weights
  end type

  type, extends(tensor_1D_t) :: vector_1D_t
  contains
    generic :: weights => gradient_1D_weights
  end type

  interface
    module function gradient_1D_weights(self) result(weights)
      implicit none
      class(tensor_1D_t), intent(in) :: self
      double precision, allocatable :: weights(:)
    end function
  end interface

end module

> ford ford.md
  Parsing files         ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 1/1 0:00:00 0:00:00 tensors_1D_m.f90
  Correlating information from different parts of your project...
  ...done in 0.000s
  Processing comments   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 11/11 0:00:00 0:00:00 gradient_1D_weights
  Creating HTML documentation... done in 0.000s
Error rendering page '/Users/rouson/Repositories/formal/doc/type/vector_1d_t.html'
⠙ Creating search index ━━━━━━━━━━━━━━━━╺━━━━━━━━━━━━━━━━━━━━━━━  40% 2/5 0:00:01 0:00:00 type/vector_1d_t.html
Traceback (most recent call last):
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/output.py", line 359, in html
    return self.render(self.data, self.proj, self.obj)
           ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/output.py", line 489, in render
    return self.template.render(
           ~~~~~~~~~~~~~~~~~~~~^
        data, project=project, **{self.payload_key: object}
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/jinja2/environment.py", line 1295, in render
    self.environment.handle_exception()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/jinja2/environment.py", line 942, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/type_page.html", line 3, in top-level template code
    {% extends "base.html" %}
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/base.html", line 144, in top-level template code
    {% block body %}
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/type_page.html", line 96, in block 'body'
    {{ macros.bound_info(bp) }}
    ^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/jinja2/runtime.py", line 784, in _invoke
    rv = self._func(*arguments)
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/macros.html", line 389, in template
    {{ binding_summary(bind) }}
    ^^^^^^^^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/jinja2/runtime.py", line 784, in _invoke
    rv = self._func(*arguments)
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/macros.html", line 302, in template
    {{ proc_line(proc, proto=proto) }}
    ^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/jinja2/runtime.py", line 784, in _invoke
    rv = self._func(*arguments)
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/macros.html", line 473, in template
    {{ deprecated(proc) }}
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/jinja2/runtime.py", line 784, in _invoke
    rv = self._func(*arguments)
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/templates/macros.html", line 173, in template
    {%- if entity | meta('deprecated') -%}
    ^^^^^^^^^^^^^^^^^^^^^
jinja2.exceptions.UndefinedError: Unknown entity 'gradient_1D_weights': This likely means an error in parsing, please check that this file compiles with a Fortran compiler

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/homebrew/bin/ford", line 6, in <module>
    sys.exit(run())
             ~~~^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/__init__.py", line 509, in run
    main(proj_data, proj_docs)
    ~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/__init__.py", line 493, in main
    docs = ford.output.Documentation(proj_data, proj_docs, project, page_tree)
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/output.py", line 256, in __init__
    self.tipue.create_node(page.html, page.loc, page.meta)
                           ^^^^^^^^^
  File "/opt/homebrew/Cellar/ford/7.0.13_2/libexec/lib/python3.14/site-packages/ford/output.py", line 361, in html
    raise RuntimeError(
    ...<3 lines>...
    )
RuntimeError: Error rendering 'vector_1d_t.html':
  File "tensors_1D_m.f90": type "vector_1D_t"
    Unknown entity 'gradient_1D_weights': This likely means an error in parsing, please check that this file compiles with a Fortran compiler

[rouson]

The above reproducer was extracted from Formal. I attempted to work around this issue by using a preprocessor macro to make the offending binding public when the ford is running the preprocessor, but that led to the next problem with a similar error but a less clear cause. These issues can be reproduced by running ford on Formal:

git clone https://github.com/berkeleylab/formal.git
cd formal
ford ford.md