He basically simulates jump to catch by hand. I understand the authority of Rob Pike, but don’t understand why this idea is great.

Processes IRL don’t look like write() three times. They look foo(); bar(); baz(); quux();, which weren’t designed to cooperate under a single context. If only there was an implicit err-ref argument which could be filled by some “throw” keyword and the rest would auto-skip to the “catch”.

Notably this approach is basically completely nonexistent in practice.