am fc9c83e9: am 1c60e46e: Produce error rather than assert when encountering a nested function.

Merge commit 'fc9c83e9cc48f1dcd32b672d12bc3c9819eaca26'

* commit 'fc9c83e9cc48f1dcd32b672d12bc3c9819eaca26':
  Produce error rather than assert when encountering a nested function.