>perl -c -e"use strict; sub f {} f;"
-e syntax OK

>perl -c -e"use strict; sub f;   f;"
-e syntax OK

>perl -c -e"use strict;          f;"
Bareword "f" not allowed while "strict subs" in use at -e line 1.
-e had compilation errors.

>perl -c -e"use strict; sub g {}  g 'abc';"
-e syntax OK

>perl -c -e"use strict;           g 'abc';"
String found where operator expected at -e line 1, near "g 'abc'"
        (Do you need to predeclare g?)
syntax error at -e line 1, near "g 'abc'"
-e had compilation errors.