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#### 4.1.5 Useful functions

Here is a description of some predefined functions it might be useful to know when writing new code to use Wisent in Semantic:

Function: wisent-collect-unmatched-syntax input

  Add input lexical token to the cache of unmatched tokens, in variable `semantic-unmatched-syntax-cache`.

  See implementation of the function `wisent-skip-token` in Error recovery, for an example of use.