In Python < 3.13 REPL:

>>> ic()
ic| Error: Failed to access the underlying source code for analysis. Was ic() invoked in a REPL (e.g. from the command line), a frozen application (e.g. packaged with PyInstaller), or did the underlying source code change during execution?

Suggestion: upon this error, fall back to pretty printing args & kwargs or current time if none, so that e.g. copy-pasting code fragments including icecream calls still yields some benefits, and it could be used to override builtin from icecream import ic as print in a pinch. Possibly update documentation to note this behavior since the error won't be informative.