Unexpected "#_ - Discard" error

[zen...@gmail.com]

I'm reading https://clojure.org/guides/weird_characters#_discard and run into this error:

user> #_({1:2})

Syntax error reading source at (REPL:247:14).

Invalid number: 1:2

Ty.

[Alex Miller]

The discard reader will read, then discard (so the following form still has to be readable). In this case, the 1:2 starts with a number so is parsed as one, but that's an invalid form.

[zen...@gmail.com]

Thank you for the clarification. I'll use ';' instead.

The docs suggest that "The form following #_ is completely skipped by the reader (This is a more complete removal than the comment macro which yields nil).". This can prove useful for debugging situations or for multiline comments.

[Laurens Van Houtven]

#_ is a reader macro—so what’s inside still has to be syntactically valid (to the reader).

When trying to parse the literal, presumably because it ends and/or starts with a digit, it is incorrectly interpreted as a number. It’s presumably missing a space depending on what you intended that literal to mean.

lvh

Ty.

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