Fix 'bhead is not a function' for forks #145
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Fixes #144
There seems to have been an attempt at a shortcut in evaluation of a
Forknode. For some reason the state machine jumps immediately toSTEP_BINDwhich isn't always valid. It's possible to be within a context where theForkis the last node to evaluate. This appeared in the bug report within abracketbecause aBracketnode uses theattemptstack and resetsbheadandbtailto null. You could probably trigger this bug withcatchError (..) (forkAff (pure unit))as well.