$ raco pkg install github://github.com/emdonahu/boris/master
Querying Git references for boris at github://github.com/emdonahu/boris/master
Downloading repository github://github.com/emdonahu/boris/master
raco setup: version: 6.3
raco setup: platform: x86_64-macosx [3m]
raco setup: installation name: 6.3
raco setup: variants: 3m
raco setup: main collects: /Applications/Racket_v6.3/collects
raco setup: collects paths: 
raco setup:   /Users/dstorrs/Library/Racket/6.3/collects
raco setup:   /Applications/Racket_v6.3/collects
raco setup: main pkgs: /Applications/Racket_v6.3/share/pkgs
raco setup: pkgs paths: 
raco setup:   /Applications/Racket_v6.3/share/pkgs
raco setup:   /Users/dstorrs/Library/Racket/6.3/pkgs
raco setup: links files: 
raco setup:   /Applications/Racket_v6.3/share/links.rktd
raco setup:   /Users/dstorrs/Library/Racket/6.3/links.rktd
raco setup: main docs: /Applications/Racket_v6.3/doc
raco setup: --- updating info-domain tables ---
raco setup: updating: /Users/dstorrs/Library/Racket/6.3/share/info-cache.rktd
raco setup: --- pre-installing collections ---
raco setup: --- installing foreign libraries ---
raco setup: --- installing shared files ---
raco setup: --- compiling collections ---
raco setup: --- parallel build using 8 jobs ---
raco setup: 7 making: <pkgs>/boris/boris
raco setup: 6 making: <pkgs>/boris/echo-server
raco setup: 5 making: <pkgs>/boris/hypertext-browser
raco setup: 4 making: <pkgs>/boris/persistent
raco setup: 3 making: <pkgs>/boris/tests
raco setup: 3 making: <pkgs>/boris/tests/boris
raco setup: 2 making: <pkgs>/boris/utils
raco setup: 2 making: <pkgs>/boris/utils/emd
raco setup: 7 making: <pkgs>/boris/boris/interpreter
Assertion failed: (((((((intptr_t)((Scheme_Object *)(scopes))) & 0x1)?(Scheme_Type)scheme_integer_type:((Scheme_Object *)((Scheme_Object *)(scopes)))->type) >= scheme_hash_tree_type) && (((((intptr_t)((Scheme_Object *)(scopes))) & 0x1)?(Scheme_Type)scheme_integer_type:((Scheme_Object *)((Scheme_Object *)(scopes)))->type) <= scheme_hash_tree_indirection_type))), function add_conditional_as_reachable, file ../../../racket/gc2/../src/syntax.c, line 5337.
Abort trap