dprint: compile default arm in core against core
previously it was only compiling against the context, which meant it
broke if an arm referred to another arm
?~ carm ~? > debug %empty-carm ~
~? > debug %found-default-arm
::~? >>> debug u.carm
- =+ carm-type=(~(play ut p.sut) u.carm)
+ =+ carm-type=(~(play ut sut) u.carm)
(what-from-hint carm-type)
--
::
