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#### 2.4.1 Grammar debugging

To help writing a new grammar, `wisent-compile-grammar` can produce a verbose report containing a detailed description of the grammar and parser (equivalent to what Bison reports with the `--verbose` option).

To enable the verbose report you can set to non-`nil` the variable:

Option: wisent-verbose-flag

  non-`nil` means to report verbose information on generated parser.

Or interactively use the command:

Command: wisent-toggle-verbose-flag

  Toggle whether to report verbose information on generated parser.

The verbose report is printed in the temporary buffer `*wisent-log*` when running interactively, or in file `wisent.output` when running in batch mode. Different reports are separated from each other by a line like this:

    *** Wisent source-file - 2002-06-27 17:33

where source-file is the name of the Emacs Lisp file from which the grammar was read. See Understanding the automaton, for details on the verbose report.

Please Note

  To help debugging the grammar compiler itself, you can set this variable to print the content of some internal data structures:

  Variable: wisent-debug-flag

    non-`nil` means enable some debug stuff.