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\DOC delete_parser
\TYPE {delete_parser : string -> unit}
\SYNOPSIS
Uninstall a user parser.
\DESCRIBE
HOL Light allows user parsing functions to be installed, and will try them on
all terms during parsing before the usual parsers. The call {delete_parser "s"}
removes any parsers associated with string {"s"}.
\FAILURE
Never fails, regardless of whether there are any parsers associated with the
string.
\SEEALSO
install_parser, installed_parsers, try_user_parser.
\ENDDOC
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