Issue 0304: Clarifying illegal tokens in #if directives

This issue has been automatically converted from the original issue lists and some formatting may not have been preserved.

Authors: WG21, WG21
Date: 2004-10-26
Reference document: ISO/IEC WG14 N1068
Submitted against: C99
Status: Fixed
Fixed in: C99 TC3
Converted from: summary-c99.htm, dr_304.htm

Summary

According to 6.10.1p3, "each preprocessing token [in a #if directive] is converted into a token." But what if, for example, the line contains an unmatched quote mark, or a preprocessing number like 4hello? How is such a preprocessing token converted into a token? No indication is given that the conversion may fail.

Suggested Technical Corrigendum

Insert new constraint paragraph after 6.10.1p1:

Each preprocessing token that remains after all macro replacements have occurred shall be in the lexical form of a token (6.4).

Comment from WG14 on 2006-04-04:

Technical Corrigendum

Insert new constraint paragraph after 6.10.1p1:

Each preprocessing token that remains after all macro replacements have occurred shall be in the lexical form of a token (6.4).