r wrote:
The code above implements an interactive session (a REPL). Therefore,
what I'd like to get is an error information printed out at the output
as soon as it becomes available.

Couple ideas:

1) Instead of yielding the error, call some global print function, then continue on; or

2) Collect the errors, then have the top-most consumer check for errors and print them out before reading the next generator output.

~Ethan~
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