Scheme Request for Implementation 251,
"Mixing groups of definitions with expressions within bodies",
by Sergei Egorov,
is now available for discussion.
Its draft and an archive of the ongoing discussion are available at https://srfi.schemers.org/srfi-251/.
You can join the discussion of the draft by filling out the subscription form on that page.
You can contribute a message to the discussion by sending it to srfi-251@srfi.schemers.org.
Here's the abstract:
Scheme has traditionally required procedure bodies and the bodies of derived constructs such as let to contain definitions followed by commands/expressions. This SRFI proposes to allow mixing commands and groups of definitions in such bodies, so that each command/expression is in the scope of all local definitions preceding it, but not in scope of the local definitions following it. This approach is backwards compatible with R7RS and upholds the intuitive rule that to find the definition of a lexical variable, one has to look up the source code tree.
Regards,
SRFI Editor