See perldiag.

Perl can give you more information on its warnings and exceptions if you let it:

#!perl
use strict;
use warnings;
use diagnostics;

sub manual_error() {
}
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Too many arguments for main::manual_error at tmp.pl line 9, near ""hi"
+)"
Execution of tmp.pl aborted due to compilation errors (#1)
    (F) The function requires fewer arguments than you specified.
    
Uncaught exception from user code:
        Too many arguments for main::manual_error at tmp.pl line 9, ne
+ar ""hi")"
        Execution of tmp.pl aborted due to compilation errors.
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And yes, this has to do with specifying a prototype (or subroutine signature) and then using a different number of parameters.