SWI-Prolog -- prolog:message_line

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Predicate message_line_element/2

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    - Printing messages
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[semidet,multifile]prolog:message_line_element(+Stream, +Term)

Hook implementation that deals with ansi(+Attr, +Fmt, +Args) in message specifications.

prolog:message_line_element(+Stream, +Term)

This hook is called to print the individual elements of a message from print_message_lines/3. This hook is used by e.g., library library(ansi_term) to colour messages on ANSI-capable terminals.