Method expectOperator

packages/compiler/src/expression_parser/parser.ts:744–747

(operator: string)

  }

  private expectOperator(operator: string) {
    if (this.consumeOptionalOperator(operator)) return;
    this.error(`Missing expected operator ${operator}`);
  }

  private prettyPrintToken(tok: Token): string {
    return tok === EOF ? 'end of input' : `token ${tok}`;