def _get_custom_constraint(self, constraint_expr: Expr,
condition_template: str) -> Callable[..., Expr]:
wilds = list(
map(lambda x: x.name, constraint_expr.atoms(_WildAbstract)))
lambdaargs = ', '.join(wilds)
fullexpr = _get_srepr(constraint_expr)
condition = condition_template.format(fullexpr)
return matchpy.CustomConstraint(
self._get_lambda(f"lambda {lambdaargs}: ({condition})"))
