It would be absolutely fantastic to have this capability.

/cc @niemeyer is this blocked in any way? Could a small sponsoring help to move this forward?

@rhysd I think there is a second case that's not handled. When decode panics, it moves into handleErr:

func handleErr(err *error) {
	if v := recover(); v != nil {
		if e, ok := v.(yamlError); ok {
			*err = e.err
		} else {
			panic(v)
		}
	}
}

Does yamlError need line information, too?

It would be necessary. But I don't have enough time to update this branch for now.

@rhysd Maybe you could take a look- forked your PR and added terminal failures with line numbers.

Looks good to me. Thank you for improving this branch. I'm closing this in favor of #901.