SRFI-5 breaks original let?

[Gary Baumgartner <gfb@cs.toronto.edu>]

In 0.6.6, opening srfi-5 seems to break some original uses of let:

> (let () 'hi)
'hi
> ,open srfi-5
Load structure srfi-5 (y/n)? y
[srfi-5 /usr/lib/scsh/srfi/srfi-5.scm]
> (let () 'hi)

Warning: invalid expression
         ()

Error: undefined variable
       standard-let
       (package srfi-5)


The file scheme/srfi/srfi-5.scm in the source distribution rewrites let
to standard-let, but there is no standard-let defined. A fix seems to be
to change

(define-structure srfi-5 (export (let :syntax))
  (open (modify scheme-level-2 (hide let)))

to

(define-structure srfi-5 (export (let :syntax))
  (open (modify scheme-level-2 (rename (let standard-let)) (hide let)))

in scheme/more-packages.scm.

I'm not familiar with the details of the structure system, so I may not
be opening the package correctly. Furthermore, if it is a bug I'm unclear
whether (hide let) should be left in.

Gary