macro-use-cases.md

List of stuff we want to be able to do with macros/slangs.

• Something like the Smart::Comments perl5 module https://metacpan.org/pod/Smart::Comments#SYNOPSIS

• A test module that has smart test failure messages

   ok($foo eq 'foo') 
  

  should behave like

   is($foo eq 'foo');
  

• A LOG macro that gets optimized out in production

  Assuming we have a LOG function defined as such:

   constant LOGGING = False;
   sub LOG($message) {
       if LOGGING {
           $*ERR.say: $message;
       }
   }
   LOG "The value is: {hard‐to‐compute()}";
  

  We want to be able to define a version of LOG that won't call hard‐to‐compute when logging is disabled.