src/vs/editor/contrib/snippet/browser/snippetParser.ts/SnippetParser/_parseEscaped
class SnippetParser:	private _parseEscaped(marker: Marker): boolean {
		let value: string;
		if (value = this._accept(TokenType.Backslash, true)) {
			// saw a backslash, append escaped token or that backslash
			value = this._accept(TokenType.Dollar, true)
				|| this._accept(TokenType.CurlyClose, true)
				|| this._accept(TokenType.Backslash, true)
				|| value;

			marker.appendChild(new Text(value));
			return true;
		}
		return false;
	}