sub find_symbol {
    ... # got to here today! (20180520)
}

##</code><code>##

$ perl xyzzy.pl
Foo!
Unimplemented at xyzzy.pl line 13.

##</code><code>##

sub find_symbol {
    ... got to here today! (20180520)
}

##</code><code>##

$ perl xyzzy.pl
syntax error at xyzzy.pl line 12, near "... got to "
Execution of xyzzy.pl aborted due to compilation errors.

##</code><code>##

sub find_symbol {
    got to here today! (20180520)
}

##</code><code>##

$ perl -c LTSpice_to_graph.pl
LTSpice_to_graph.pl syntax OK

##</code><code>##

$ cat xyzzy.pl
#!env perl
use strict;
use warnings;

find_symbol();

sub find_symbol {
    got to here today
}

$ perl -c xyzzy.pl
xyzzy.pl syntax OK

$ perl -MO=Concise xyzzy.pl
6  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 5 xyzzy.pl:5) v:*,&,{,x*,x&,x$,$ ->3
5     <1> entersub[t2] vKS/TARG,STRICT ->6
-        <1> ex-list K ->5
3           <0> pushmark s ->4
-           <1> ex-rv2cv sK/STRICT,1 ->-
4              <#> gv[*find_symbol] s/EARLYCV ->5
-     <;> ex-nextstate(main 7 xyzzy.pl:10) v:*,&,{,x*,x&,x$,$ ->6
xyzzy.pl syntax OK

##</code><code>##

$ perl -version

This is perl 5, version 26, subversion 2 (v5.26.2) built for x86_64-cygwin-threads-multi
(with 7 registered patches, see perl -V for more detail)

##</code><code>##

sub find_symbol {
    I got to here today
}

##</code><code>##

$ perl -c xyzzy.pl
Bareword "today" not allowed while "strict subs" in use at xyzzy.pl line 8.
xyzzy.pl had compilation errors.