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This is like \echo except that the text is sent to stderr not stdout. In passing, fix a pre-existing bug in \echo and \qecho: per documentation the -n switch should only be recognized when it is the first argument, but actually any argument matching "-n" was treated as a switch. (Should we back-patch that?) David Fetter (bug fix by me), reviewed by Fabien Coelho Discussion: https://postgr.es/m/20190421183115.GA4311@fetter.org