wdiag.icn: Procedure to write values with labels

procedure wdiag:           write labeled global values

link wdiag
March 25, 2002; Ralph E. Griswold
This file is in the public domain.

widag(s1, s2, ...) writes the values of the global variables named s1, s2,
... with s1, s2, ... as identifying labels.

It writes a diagnostic message to standard error output if an
argument is not the name of a global variable.

Note that this procedure only works for global variables; there is
no way it can access the local variables of the procedure from which
it is called.