Scheme Request for Implementation 188,
"Splicing binding constructs for syntactic keywords,"
by Marc Nieper-Wißkirchen,
is now available for discussion.
Its draft and an archive of the ongoing discussion are available at https://srfi.schemers.org/srfi-188/
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Here's the abstract:
Splicing binding constructs for syntactic keywords are versions of let-syntax and letrec-syntax that can be used in a definition context in the same way as begin.