In interactive mode, the warning in untaken branches is misleading
when \endif is on the same line as the commands that
are skipped. For instance:

  postgres=# \if false \echo NOK \endif
  \echo command ignored; use \endif or Ctrl-C to exit current \if block

From the point of view of the user, the execution flow has exited
the branch already when this warning is displayed.
Of course issuing the recommended \endif at this point doesn't work:

  postgres=# \endif
  \endif: no matching \if

Maybe that part of the message: 
"use \endif or Ctrl-C to exit current \if block"
should be displayed only when coming back at the prompt,
and if the flow is still in an untaken branch at this point?

Best regards,
Daniel Vérité
PostgreSQL-powered mailer: http://www.manitou-mail.org
Twitter: @DanielVerite

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