I think I just wrote a non-ASCII comma or space somewhere in my code... damn me for having so many keyboards...

weird flex but ok

Well, if the compiler of ide is any good it will pinpoint exactly where you did it :)

Or copy pasted code?

It is the one which is underlined with a red wavy line.

Wait... so there are keyboards which let you type non ascii commas or white spaces? What kind of keyboards are that?

@Voxera no it ain't as good. I was using VSCode. Could you share with me what IDE's can detect that please?

@Lensflare many non-latin language scripts have special punctuation:
Comma "，" vs ","
dot: "。"
space: " "
colon: "：" vs ":"
Question mark: "？" vs "?"
Semicolon: ";" vs ";"

@eo2875 vscode by it self is just an editor.

What you need is a plugin for linting if you want it to find things before compiling.

And how good that is depends on the language and the linting or compiler.

But since a non ascii char at the place if a comma should result in illegal code in most cases it should be detectable.

The only exception would be a char that is counted as a letter in between other letters in a way that still does not break the code.

And that seems far fetched.