Server requires #lang line even though #reader is present.

[jlefkoff]

By default, opening a file created in DrRacket in VSCode throws the error Missing or invalid #lang line from define lang-diag as seen in check-syntax.rkt. However this file compiles and runs just fine. Below is an example of the first three lines inserted by DrRacket.

;; The first three lines of this file were inserted by DrRacket. They record metadata
;; about the language level of this file in a form that our tools can easily process.
#reader(lib "htdp-intermediate-lambda-reader.ss" "lang")((modname 1-family) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f () #f)))

[dannypsnl]

Because this project open file with racket:text% class, the class requires the language file must have #lang line, so it would only accidentally work for non-racket language (I know it sounds weird)