private DirectiveTriviaSyntax ParseShebangDirective(SyntaxToken hash, SyntaxToken exclamation, bool isActive)
{
// Shebang directives must appear at the first position in the file
// (before all other directives), so they should always be active.
Debug.Assert(isActive);
return(SyntaxFactory.ShebangDirectiveTrivia(hash, exclamation, this.ParseEndOfDirectiveWithOptionalPreprocessingMessage(), isActive));
}