[Jprogramming] stack error or private/public name collision

[Xiao-Yong Jin]

Is the following a bug?

   g=:]
   a=:1 :0
g=.u
g y
)
   g a 1
|stack error: g
|       g y
   a=:1 :0
f=.u
f y
)
   g a 1
1

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