tests/sitecustomize.py

rustdoc: nodemap doc refreshing

Not pretending to be comprehensive.

- correcting some inconsistencies
- adding a few missing doc-comments
- adding more cross references (in some cases it's right beside
  the current documentation item, but it will nevertheless also
  be useful, because `rustdoc` will warn us if inconsistencies
  arise).

import os

if os.environ.get('COVERAGE_PROCESS_START'):
    try:
        import coverage
        import uuid

        covpath = os.path.join(
            os.environ['COVERAGE_DIR'], 'cov.%s' % uuid.uuid1()
        )
        cov = coverage.coverage(data_file=covpath, auto_data=True)
        cov._warn_no_data = False
        cov._warn_unimported_source = False
        cov.start()
    except ImportError:
        pass