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make parser throw error if predicate not present
#841 I don't know if that expected to not throw an error, but seems weird to me. Probably in my use case I could use a Walk and check for the function that user pass, but I think the option Disabled don't make any sense.
I think if function all was disabled, it should be able to be overwritten.
@davixcky I will merge this. But will be nice to add tests. Could you please add tests in a separate PR? Thanks