Error recovery for unexpected continuation keywords about juliasyntax.jl HOT 1 OPEN

Generally, this should be solvable by an arbitrarily long look-ahead for continuation keywords

If we cap the lookahead at some large but not huge value I feel this is acceptable. But recovery and error reporting really is hard: in general it requires both look ahead and look behind to do a good job.

Any parsing algorithm which assumes the source is "well-formed by default" is likely to enter weird states where there's not enough local information available in the program to emit the ideal error. Hence wanting #93 or something similar... (really, I believe parsing of broken text and emitting error messages and warnings are in the "big pile of heuristics" category of software which in general is better learned with a data driven ML approach... but that would be a research project ...)

from juliasyntax.jl.