Unclear error message on parsing cross and native files #12025

Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/mesonmain.py", line 194, in run
    return options.run_func(options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/msetup.py", line 318, in run
    app.generate()
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/msetup.py", line 189, in generate
    env = environment.Environment(self.source_dir, self.build_dir, self.options)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/environment.py", line 519, in __init__
    config = coredata.parse_machine_files(self.coredata.cross_files)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/coredata.py", line 1014, in parse_machine_files
    parser = MachineFileParser(filenames)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/coredata.py", line 968, in __init__
    self.sections[s] = self._parse_section(s)
                       ^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/mesonbuild/coredata.py", line 981, in _parse_section
    res = self._evaluate_statement(ast.lines[0])
                                   ~~~~~~~~~^^^
IndexError: list index out of range

ERROR: Unhandled python exception

    This is a Meson bug and should be reported!