From the CHANGELOG:

• Add define-coordinates implementation #393:

  • Forms like (let-coordinates [(up x y) R2-rect] ...) will now work even if
    up is not present in the environment. Previously this syntax was valid,
    but only if up had been imported.

  • Adds the sicmutils.calculus.coordinate/define-coordinates macro, also
    aliased into sicmutils.env. This macro allows you to write forms like

(define-coordinates (up t x y z) spacetime-rect)
(define-coordinates [r theta] R2-polar)

and install set of bindings for a manifold's coordinate functions, basis
vector fields and basis form fields into a namespace. This is used liberally
in Functional Differential Geometry. (You might still prefer let-coordinates
for temporary binding installation.)

• Converts many of the sicmutils.fdg test namespaces to use the new
  define-coordinates macro, making for a presentation closer to the book's.

• Fixes a Clojurescript warning in sicmutils.util warning due to
  redefinition of clojure.core/uuid