Improve the module-not-found error message when we didn't actually
search for it anywhere. This happens when we know all the places it
might be: either in the current program, or a package.
<+> ppr pkg)
NotFound files
<+> ppr pkg)
NotFound files
+ | null files
+ -> ptext SLIT("it is not a module in the current program, or in any known package.")
| verbosity dflags < 3
-> ptext SLIT("use -v to see a list of the files searched for")
| otherwise
| verbosity dflags < 3
-> ptext SLIT("use -v to see a list of the files searched for")
| otherwise