Discussion
The lexical analyser typically removes
Answer: C
Correct answer: white space and comments from the stream handed to the parser
Comments and white space carry no meaning for the grammar, so the scanner discards them and hands the parser a clean token stream.
The removal is not quite unconditional: white space still separates lexemes, so the scanner uses it before dropping it, and it is significant in languages that use indentation for structure. Operators and identifiers are the very things the scanner produces tokens for, and dead code elimination happens much later.
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