Scheme Request for Implementation 172,
"Two Safer Subsets of R7RS,"
by John Cowan,
is now available for discussion.

Its draft and an archive of the ongoing discussion are available
at <https://srfi.schemers.org/srfi-172/>.

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Here's the abstract:

  This SRFI provides two libraries for use with R7RS that provide
  a way to sandbox the eval procedure to make it safer to use in
  evaluating Scheme expressions of doubtful provenance.  The
  intention is to call eval, passing it an S-expression
  representing a Scheme procedure and the environment defined by
  one of these libraries.  Since code evaluated by eval runs in a
  null lexical environment, the resulting procedure can then be
  invoked with less concern about possible side effects.

Regards,

SRFI Editor