As well as the potential for inlining that has already been pointed out, you also get a compile time error if you inadvertently introduce something that could be interpreted as an argument to the constant subroutine, see for instance this stupid example:

sub FOO  { 1; }
                                                                      
+          
sub BAR () { 2; }
                                                                      
+          
my $foo = FOO 1;
                                                                      
+          
my $bar = BAR 1;
[download]

You get the error from the BAR 1 whereas the FOO 1 is undetected, obviously in real code this could possibly be much less obvious and lead to subtle bugs.

/J\

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