Bump up recursion limit for imports
Initial implementation of boxes and their chaperone/impersonator baggage
Update some of the tests
Add boxes to is_impersonator_of and is_chaperone_of
Add impersonator/chaperone construction operations for boxes
Add 'immutable?' operation
Setting the recursion limit prevents translation
Add support for box literals
Actually expose 'immutable?'
Add 'box-cas!'
Disable initiation of tracing for chaperone/impersonator handlers
Fix calling Racket with space-containing file names
Allow multiple variables in define-values
Include boxes in impersonator? and chaperone? properly
Add boxes to equal?
More sane default sizes for tests
Ignore 'begin-for-syntax' AST nodes
Additional large tests
Use prebuilt infrastructure for 'box?'
Merge remote-tracking branch 'origin/structs'