[Jprogramming] under locale

[David Lambert]

Use case:  u&.cd invokes u in some directory, then cd^:_1 restores the
working directory.  cd is a method in another locale that stores the
current directory before the change.  coinsert doesn't provide the desired
encapsulation.  What, please, is the solution?

   coclass'co'
   a=:3 :'FIELD=: y'
   b=:3 :'FIELD'
   f=: a :. b f.

   coclass'base'
   o=:conew'co'

   ([: echo 'invoked u'"_)&.f__o 98732459
invoked u
|noun result was required
|       FIELD

   b__o''
98732459

   coinsert'co'

   ([: echo 'invoked u'"_)&.f < 245
invoked u
+---+
|245|
+---+

   FIELD=: 'and stream'

   ([: echo 'invoked u'"_)&.f < 245
invoked u
+---+
|245|
+---+

   FIELD
+---+
|245|
+---+