Set and variables

[Suresh Govindachar]

Hello

  While one can always :let &l:tw, &g:tw or &tw to a variable, 
  here are some observations on setting to variables and spaces.

  The following work:

     :let foo = 68
     :exec 'set tw='.foo

  but adding spaces for readability generates an error message! 

     :exec 'set tw = ' . foo

  Setting to a variable without use of exec fails with or 
  without spaces -- none of the following work:

     :set tw=foo
     :set tw = foo

  Also,

     :let boo = 'set tw = 80' followed by 
     :exec boo fails,

  but :let boo = 'set tw=80' followed by 
      :exec boo succeeds!
   
 
  --Suresh