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> 1) A soft keyword that can be used as an identifier in all places
> where identifiers are accepted. Soft keywords are not hidden by
> variables of the same name (they occur in the grammar at places where
> no identifier is allowed).

Lua used that scheme for the "in" keyword in Lua 4.0: although it was listed
as a hard keyword in the manual, it was implemented as a soft keyword.
If you want to experiment with syntax changes in Lua, try metalua or
token filters. See