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Identifiers

At some tokenisation boundaries, the preprocessor may tokenise a sequence of characters as one identifier. The first character must be

• an upper-case letter
• a lower-case letter
• an underscore
• a dollar sign, if /Ze is active

Subsequent characters may be any of the above and also any decimal digit. The identifier comprises as many consecutive characters as are eligible. The input stream is to be understood as having trigraphs and line splices already resolved.

It is a fatal error (C1064) if an identifier is too long. The limit in version 13.00.9466 is 4096 characters.

It is a fatal error (C1004) if an identifier ends its input stream.