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set_prolog_flag/2
ISOset_prolog_flag(+FlagName, +Value)
same as:
prolog_flag(FlagName, _, Value)
atom, must be nonvar
term, must be nonvar and belong to proper type/domain
instantiation_error
An argument is unbound or insufficiently instantiated.
type_error
FlagName is not an atom.
domain_error
FlagName is not a valid flag name, or Value is not a valid value for it.
permission_error
The flag is read-only.
current_prolog_flag/2
, prolog_flag/[2,3]
, ref-lps-flg.