errors occuring in beforeBlock,afterBlock event handlers are treated as invalid blocks

[kumavis]

https://github.com/ethereumjs/ethereumjs-vm/blob/19a83f71d913a0e7c96d851c0ed192a9fba5a479/lib/runBlock.js#L50-L56

no error is thrown -- these errors can be simple typos, makes it hard to debug

vm.on('afterBlock', function(block){
  // typo or other accidentally error
  throw new Error()
})

[axic]

What do you propose?

Note, this behaviour is shared with all the other events in the vm.

[holgerd77]

Open for > 2 years with no one picking it up, will close for now.