Minor assertion.
Merge branch 'master' of github.com:jbdeboer/bridge
Better visualization in dump_ast (good for long and nested trees.)
Instance vars are a flag on a symbol.  There's no need for a scope dedicated to them.
Pull from deboer.
Merge branch 'master' of github.com:jbdeboer/bridge
Merge branch 'master' of github.com:jbdeboer/bridge
Fixed the block_visitor (many thanks to deboer).
identifier visitor