[Bug-apl] )host to take string

[enztec]

presently )host takes direct code

     )host vi workspaces/a1    works (disregard Vim: Warning: Output is not to 
a terminal    using )host vi workspaces < `tty` > `tty` is the real command)

putting it in quotes

     )host vi 'workspaces/a1'    works

     a←'a1'

     'workspaces/', a 
workspaces/a1

but 
      )host vi 'workspaces/',a

edits  workspaces,a   not workspaces/a1 as it should

is there a easy way around this or is it hard work to fix in the code?