There is a module that provides this facility:
use Sub::Override;
use strict;
use warnings;
$, = ' ';
$\ = "\n";
sub a{ 'a' }
sub b{ 'b' }
sub c{ 'c' }
sub d{ ( a, b, c ) };
print d();
{
my $override = Sub::Override->new;
$override->replace(a => sub { "changed" })
->replace(b => sub { "changed" })
->replace(c => sub { "changed" });
print d();
}
print d();
output:
a b c
changed changed changed
a b c
Tool completed successfully
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