set substitute from-name to-path
Add a substitution rule replacing from-name into to-path in source file names. If a substitution rule was previously set for from-name, the old rule is replaced by the new one.
Spaces in “filenames” like <frozen importlib._bootstrap> messes up our normal shell tokenization, so we have added a hack to ignore <frozen .. >.
So, for frozen files like <frozen importlib._bootstrap>, use importlib._bootstrap