[Bug-apl] Crash when refining an incorrect function

[Elias Mårtenson]

To reproduce:

First, enter a function definition that will cause an error when called:

∇ r←x z y

r←x+y

∇

Then, call the function:

      10 z 20

VALUE ERROR

z[1]  foo

      ^

Finally, attempt to define a correct version of the function, and the session will crash as soon as the first line is entered:

      ∇ r←x z y

pure virtual method called

terminate called without an active exception

Aborted (core dumped)

Regards,

Elias