disabled signatures instead of allowing renaming because they are not working anyway (?)
I broke this test; I am not sure why it worked in the first place -- to be checked
bring back structure type w/o re-enabling broken signatures
add a scribble/blueboxes library to get the content of the
blueboxes in unstyled form

(moved from DrRacket here)
use scribble/blueboxes
add some debugging output to try to figure out what's different about drdr
when running the check syntax tests
change a hash so it doesn't map from syntax objects directly, but
instead constructs a suitable key
Show blueboxes info in xrepl with ,describe
signatures broke a while back and nobody uses then in *SL
add a little more info in the syntax check printouts for drdr
add a will-executor example
v6.1 installers info
v6.1 announcement text
Use blueboxes cache in xrepl
a little more extra info for drdr
Synch German string constants with latest.
modernize stlc.rkt and eliminate ellipses so that well-typed generation works
scribble: fix image metrics in HTML output for exact fractions

Avoid generating sizes such as `1003790/1581`.
use-before-definition analysis: fix checking of `set!` form

Treat the RHS of `set!` as escaping to an unknown context, so
that any variables it references are treated as unprotected.
use-before-definition analysis: fix handling of `let[*]`

Bindings in `let` and `let*` need to be tracked much the same
way as for `letrec`, so that

 (letrec ([b (let ([d (lambda () c)])
               (d))]
          [c 1])
   b)

raises an exception.