The value which should be an Err.
The unwrapped item.
import { err, ok, unwrapErr } from "./result.ts";
import { assertEquals, assertThrows } from "../deps.ts";
assertThrows(() => unwrapErr(ok(3)), "unwrapped Ok");
assertEquals(unwrapErr(err(4)), 4);
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Unwraps the
Errvalue from aResult, or throws an error.