(dev2.0) Inherited type constructor issue

This is compiling just fine with the master branch, but not in dev2.0:

open System.Collections.Generic

type ConcurrentDictionary<'TKey, 'TValue when 'TKey: equality> =
    inherit Dictionary<'TKey, 'TValue>
    new () = { inherit Dictionary<'TKey, 'TValue>() }
    new (comparer: IEqualityComparer<'TKey>) = { inherit Dictionary<'TKey, 'TValue>(comparer) }
    member x.TryAdd (key:'TKey, value:'TValue) = x.[key] <- value; true

Here is the result, the constructors are messed up, the return is not in the right place:

import { tryGetValue, comparerFromEqualityComparer } from "./fable-core.2.0.0-alpha-020/Util";
import { createMutable } from "./fable-core.2.0.0-alpha-020/Map";
export function ConcurrentDictionary$00602$$$$002Ector() {
  new Map([]);
  return new ConcurrentDictionary$00602();
}
export function ConcurrentDictionary$00602$$$$002Ector$$1(comparer) {
  createMutable([], comparerFromEqualityComparer(comparer));
  return new ConcurrentDictionary$00602();
}
export function ConcurrentDictionary$00602$$TryAdd(x, key, value) {
  x.set(key, value);
  return true;
}

[ncave]

Closing as the suggested alternative seems to work.

[alfonsogarciacaro]

Hmm, the REPL gives me something like this:

export class ConcurrentDictionary extends Map {
  static [".ctor_0"]() {
    new Map();
    return new ConcurrentDictionary();
  }

  static [".ctor_1"](comparer) {
    create(null, fromEqualityComparer(comparer));
    return new ConcurrentDictionary();
  }

  TryAdd(key, value) {
    this.set(key, value);
    return true;
  }
}

Probably this is working due to a happy coincidence of not compiling to ES5, using a JS engine that accepts inheritance from native types with classes, and the autogeneration of the class constructor. But the secondary constructors look faulty, and this will definitely not work with a custom comparer 😕