great local variables examples

[Dan Jacobson]

Continuing "great examples of the use of local variables, in particular
regarding the compile command" for addition to the documentation, here is

! Local Variables:
! compile-command: "xrdb .Xresources"
! End:

However having to hardwire the filename into the file is dumb.
One would want to use something like

! compile-command: (concat "xrdb " buffer-file-name)

But 1. the user is then asked a question upon find-file, and
2. Wrong type argument: stringp, concat.