i wanted to specify just the format, and leave the contents for a follow-on, and i was blocked until i can specify the contents too

Use of _ I’ve encountered is not as a black hole (void) but as a readable reference to the last thing bound.

idea that popped into my head a few minutes ago while looking at some debugging tooling that someone made... what if you could attach metadata to stack traces to identify specific function invocations?
for example lets say you have something like an event emitter, you could do something like

class Emitter {
  emit(name, data) {
    System.setStackMetadata(name);
    // ...
  }
}

and then in a stack trace, it would be identified as emit (event name) instead of just emit

this reminded me of $_ in Perl

thats cool

I think web platform folks asked for the ocean to be boiled

Pointer?