/// <summary>
/// Creates a new variable scope.
/// </summary>
/// <returns>
/// A <see cref="IDisposable" /> handle that will return to the previous scope when disposed.
/// </returns>
internal IDisposable NewScope()
{
_current = new VariableScope(_current);
return(new ScopeHandle(() => _current = _current?.Parent));
}
/// <summary>
/// Initializes a new instance of the <see cref="VariableScopeStack" /> class.
/// </summary>
internal VariableScopeStack()
{
_current = new VariableScope(s_emptyParameters);
}