Produces a message on the standard error output, describing the last
error encountered during a call to a LASH function.
The argument string s is printed first, followed
by a colon and a blank, and then by the message
and a newline. (However, if s is a null pointer
or points to an empty string, the colon is not printed.) To be of
most use, the argument string should include the name of the program
that incurred the error. The error number is
taken from the global variable
lash_errno,
which is set when errors occur but not cleared
when non-erroneous calls are made.