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String literals as tokens serve two distinct purposes: freeing from having to implement the keyword matching in the scanner, and improving error messages. Most of the time both can be achieved at the same time, but on occasions, it does not work so well. We promote their use for error messages. We will also still support the former case, but it is _not_ the recommended approach. * doc/bison.texi (Tokens from Literals): Clearly state that we don't recommend looking up the token types in the list of token names.