Field.greaterThan not working outside circuit

[mitschabaude]

reproduction:

await isReady;
let x = Field(1).greaterThan(0);

throws:

Error: This function can't be run outside of a checked computation.

from here:
https://github.com/o1-labs/snarky/blob/045d11106d1dcb217c249784dc694d05931f30a8/src/base/snark0.ml#L745-L747

The same issue can sometimes lead to different issues because snarky internal states aren't properly cleaned up, so that it thinks it is in a checked computation, but will return a witness outside the circuit.

Which is actually another bug!

[mitschabaude]

Reproduction of different issue caused by not cleaning up "is running":

import { Field, isReady, Experimental, Struct } from 'snarkyjs';

await isReady;

let DummyProgram = Experimental.ZkProgram({
  publicInput: Struct({}),
  methods: {
    emptyMethod: {
      privateInputs: [],
      method(publicInput: {}) {},
    },
  },
});

await DummyProgram.compile();

// now snarky thinks it's "running"

let x = Field(1).greaterThan(0);

console.log(x);

This version doesn't throw, which implies that compile() leaves the internal state Run_state.is_running !state = true

the log shows that x is a witness even though this is not supposed be circuit code:

{ value: [ 2, [ 0, [Uint8Array] ], [ 3, [Uint8Array], [Array] ] ] }