$ echo 0 >foo.pl

$ perl -e"require q!foo.pl!;"
foo.pl did not return a true value at -e line 1.

$ perl -Mdiagnostics -e"require q!foo.pl!;"
foo.pl did not return a true value at -e line 1 (#1)
    (F) A required (or used) file must return a true value to indicate
+ that
    it compiled correctly and ran its initialization code correctly.  
+It's
    traditional to end such a file with a "1;", though any true value 
+would
    do.  See perlfunc/require.

Uncaught exception from user code:
        foo.pl did not return a true value at -e line 1.
 at -e line 1

$ perl -e"require q!foo.pl!;" 2>&1 |splain
foo.pl did not return a true value at -e line 1 (#1)
    (F) A required (or used) file must return a true value to indicate
+ that
    it compiled correctly and ran its initialization code correctly.  
+It's
    traditional to end such a file with a "1;", though any true value 
+would
    do.  See perlfunc/require.


$
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