Tracing execution

• Run instrumented foo.
• See also:
• MD5 = checksum_code_path( FUNCTION )
• PATH = trace_code( FUNCTION )
• trace( TRACE, FUNCTION )
• TRACE is called for every opnode in the optrees being executed

use Runops::Trace 'checksum_code_path';
for ( 1 .. 1000 ) {
  my @args = random_junk();
  $md5 = checksum_code_path( sub { $results = foo( @args ) } );
  next if $seen{ $md5 } ++;

  push @great, \ @args;
}