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The constraints are initialized with NULL pointers for underlying expressions.
ap_environment_is_eq(array->env,cons->env). Nothing is duplicated. The argument should never be cleared (its environment is dereferenced). If a constraint was already stored, it is first cleared. Return true iff problem (index or
ap_linexpr1_XXXfunctions (see section Change of dimensions and permutations of linear expressions of level 1).