patch for guiding declarations warning message

[Alexandre Oliva]

Hi!

As the current guiding declaration warning message seems to have led
many users to confusion, here's a patch that makes the warning message
a bit clearer.  The actual text was suggested by Mark Mitchell in
private e-mail.

-- 
Alexandre Oliva
mailto:oliva@dcc.unicamp.br mailto:aoliva@acm.org
http://www.dcc.unicamp.br/~oliva
Universidade Estadual de Campinas, SP, Brasil
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