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When a method fails,
this method allows the application to read
the error code.
p_error_string is reserved for use by
the internals.
Applications should set it to NULL
.
Return value: The last error code from a Libmarpa method. Always succeeds.
Sets the error code
to MARPA_ERR_NONE
.
Not often used,
but now and then it can be useful
to force the error code to a known state.
Return value: MARPA_ERR_NONE
.
Always succeeds.