Function pushSafeScope

src/compute-engine/boxed-expression/rules.ts:889–896

* Push a clean scope - safe for the boxing of rules - that only inherits from the system scope * (index 0), not from the global scope or user-defined scopes. This prevents user-defined symbols * (like `x` used as a function name in `x(y+z)`) from interfering with rule parsing. The system * scope

(ce: ComputeEngine)

    onMatch: onMatch as BoxedRule['onMatch'],
    onBeforeMatch: onBeforeMatch as BoxedRule['onBeforeMatch'],
  };
}

/**
 * Push a clean scope - safe for the boxing of rules - that only inherits from the system scope
 * (index 0), not from the global scope or user-defined scopes. This prevents user-defined symbols
 * (like `x` used as a function name in `x(y+z)`) from interfering with rule parsing. The system
 * scope contains all built-in definitions.
 *
 * This also crucially prevents wildcards from being given definitions where captured & bound.
 *