How deeply does Learn Haskell by Example cover comment?

Implements comment recognition and recursive skipping alongside whitespace, without treating comment contents as data.

Comment

As explained in Learn Haskell by Example

A comment is non-data text embedded in a file format and delimited according to that format's syntax.

A comment is non-data text embedded in a file format. In a PNM header, it starts with % and continues until a newline, so the parser can discard it while reading image metadata. section 12.2.2

Parsing PNM comments

With Attoparsec, read the opening marker with char '%' and consume the remaining characters with takeWhile (/= '\n'). Because comments may appear between header values, combine the comment parser with whitespace handling and recurse until neither is present.

How Learn Haskell by Example covers it

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