AFAICT Chez Scheme's `fluid-let` is compatible with [SRFI 15](https://srfi.schemers.org/srfi-15/srfi-15.html). In that case, this would be a compliant implementation of the latter: ```Scheme (library (srfi :15) (export fluid-let) (import (only (chezscheme) fluid-let))) ``` The SRFI also supplied a portable implementation using `dynamic-wind`.
