Commits on Nov 9, 2024

1. [lex.pptoken] Separate out placeholder keywords …

   The _preprocessing-token_ term is defined as one of another set of
   grammar productions, with the three placeholder tokens standing out
   as specific single tokens.
   
   Moving the placeholder tokens into their own production simplifies
   both the _preprocessing-token_ and _keyword_ grammar productions,
   plus it guarantees a consistency for the set of placeholder between
   both places.  IT also makes it easier for [cpp] to directly
   cross-reference where needed.
   
   Pedantically, the term placeholder token itself is problematic as
   tokens are a phase 7 concern, where they become keywords.  Within
   the earlier phases where these placeholders are used the correct
   term is a preprocessing token, so strictly these should be
   placeholder preprocessing tokens, which is a mouthful.  So renaming
   the term to placeholder keyword, which is hopefully less of a
   concern as there are no keywords in phase 3--6 to confuse with
   phase 7 keywords.
   
   Finally, clean up the informative list in text of the various kinds
   of preprocessing tokens, rendering as a list in the source (one kind
   per line) and adding a cross-reference to each such item.

   

   AlisdairM committed Nov 9, 2024
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