[Ur] Combinator Parsing in Ur: Anonymous function remains at code generation

[orchidaceae phalaenopsis]

> Can you point me to a full program demonstrating this problem?

Here is the test-case for this https://gist.github.com/enn/7a6fb1d62b88e2f8bf89

> Why do you want lazy evaluation?

Mentioned in the parsec paper, delaying there is an algorithmic
speedup that enables it to ignore a branch that it would otherwise
check.