Tools for debugging recursion problems? about combine

[jwiegley]

I've worked around this for now with:

#![recursion_limit = "1024"]

[Marwes]

There isn't any tools directly to debug it (unless rustc provides some general ability to print out the entire, long type). But if you have a good idea of how your grammar looks you may be able to figure out where these large types appear as they would correlate to wide and deeply constructed parsers that use impl Parser.

If you know (or guess) where these large parsers are then you can use the parser! macro, the opaque parser or just box the parser to break this large parser up.

[jwiegley]

How do I determine which parsers are the deeply constructed ones? None of mine are beyond 20 lines long.

[Marwes]

"Deeply" in this case relates to multiple impl Parser returning functions calls, each call will create a larger and larger actual type, but you can break it up by using parser! or opaque.