[Python-ideas] Yield-From: GeneratorReturn exception

[Greg Ewing]

While attempting to update the PEP to incorporate a
GeneratorReturn exception, I've thought of a potential
difficulty in making the exception type depend on
whether the return statement had a value.

Currently the StopIteration exception is created after
the return statement has unwound the stack frame, by
which time we've lost track of whether it had an
expression.

-- 
Greg