a=: {{> ". 'b' [ 6!:3]2}} t.'' 0
b=: {{> ". 'a' [ 6!:3]2}} t.'' 0
>a
[hang]
actually, it's enough to make it wait on itself:
a=: {{> ". 'a' [ 6!:3]2}}t.'' 0
>a
[hang]
Probably it should be an error. E.G. pthread_join will return EDEADLK
when it encounters an analogous situation.
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