11.3.87 frozen/2

Synopsis

frozen(+Var,-Goal)

Goal is unified with the conjunction of goals blocked on Var.

Arguments

Var

term, must be var

Goal

callable

Description

If some goal is blocked on the variable Var, or Var has attributes that can be interpreted as a goal (see lib-atts), then that goal is unified with Goal. If no goals are blocked, Goal is unified with the atom true. If more than one goal is blocked, a conjunction is unified with Goal.

Exceptions

uninstantiation_error

Var is not a variable

See Also

ref-sem-sec.