Implementation of the join! macro.
| expr_chain | Contains Chain trait and implementation, expressions, groups and utils to work with all of them.
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| handler | Handler defines handler function of 3 possible types: map, and_then and then.
map and and_then will be evaluted in case of all successful results and then will be evaluated in any case,
which allows user to define its own handlers for every error.
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| join | Defines Join struct and generate_join function to generate output of the join! macro based on input and given config.
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| group_determiner | Creates GroupDeterminer with given (ActionGroup => tokens; length; Fn that checks TokenStream of parsed tokens`)
Example:
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| instant_and_deferred_determiners | Creates instant and deferred GroupDeterminer's for given ActionGroup.
Deferred are prefixed by ~.
For example: -> is instant, ~-> is deferred.
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| tokens_checker | Creates function which checks if ParseStream next values are provided tokens. (Max = 3).
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