! Existence error in user:environ/2
! procedure user:environ/2
does not exist
! goal: user:environ(no_terminal_colors,true)
* Non-determinate: gensym:gennum/1
(clause 1)
* Calls nondet predicate retract/1.
! warning: predicate gensym:flag/2
is dynamic.
! Some nondeterminism may have been missed.
! Add (or move) the directive
! :- dynamic gensym:flag/2
.
! near the top of this file.