Can not use nim 2's new default instantiation with any object type with a `distinct DateTime` field

[PhilippMDoerner]

What happened?

Related issue that fixes a more fundamental version of this problem: #20681

This is basically a more specialized version/an edgecase of that very same issue, so I'll copy the initial description:

It is currently impossible to instantiate a distinct DateTime object at compile time. That makes it difficult to make use of nim 2's new feature of #20480 for any object with fields of a custom version of the DateTime type.

My original minimal example:

import std/times

type DjangoDateTime = distinct DateTime

type Default = object
  data: DjangoDateTime = DjangoDateTime(DateTime())

let x = default(Default)
echo x.repr

@ringabout narrowed down the issue more specifically to be

import std/times
import std/macros

type DjangoDateTime = distinct DateTime

block:
  macro foo(x: static DjangoDateTime) =
    discard x

  macro foo2: untyped =
    var x: DjangoDateTime = DjangoDateTime(DateTime())

    result = quote do:
      foo(`x`)

  foo2()

Nim Version

Nim Compiler Version 1.7.3 [Linux: amd64]
Compiled at 2022-10-29
Copyright (c) 2006-2022 by Andreas Rumpf

git hash: 534c97e
active boot switches: -d:release

However, I've been told by @ringabout that the issue in his example is more fundamental and replicable in older nim versions as well

Current Standard Output Logs

Attempt 1:
type mismatch: got 'DateTime' for 'DateTime(nanosecond: 0, second: 0, minute: 0, hour: 0, monthdayZero: 0,
         monthZero: 0, year: 0, weekday: dMon, yearday: 0, isDst: false,
         timezone: nil, utcOffset: 0)' but expected 'DjangoDateTime = distinct DateTime'

Attempt 2:
<PROJECT_PATH>/src/playground.nim(16, 7) template/generic instantiation of `foo2` from here
<PROJECT_PATH>/src/playground.nim(13, 14) Error: the field 'nanosecond' is not accessible.

Expected Standard Output Logs

No compiler error

Possible Solution

This problem is absolutely beyond me, no idea.

Additional Information

No response

[ringabout]

I got another simpler related cases, I will open a separate issue.

import times

proc foo(x: static DateTime = Datetime()) =
  discard

It fails at 1.6.8