Const variant object fields are incorrectly set to zero

[exelotl]

When a variant object is bound to a const, the latter fields are initalised to 0, which overwrites the former fields.

Example

type
  Kind = enum
    A, B, C
  Rocket = object
    case kind: Kind
    of A: a: int
    of B: b: int
    of C: c: int

const a = Rocket(kind: A, a: 20)
const b = Rocket(kind: B, b: 30)
const c = Rocket(kind: C, c: 40)

echo a
echo b
echo c

Current Output

(kind: A, a: 0)
(kind: B, b: 0)
(kind: C, c: 40)

Expected Output

(kind: A, a: 20)
(kind: B, b: 30)
(kind: C, c: 40)

Additional Information

This only seems to happen when using const
i.e. the following are fine:

let a = Rocket(kind: A, a: 20)
echo a                        # (kind: A, a: 20)
echo Rocket(kind: B, b: 30)   # (kind: B, b: 30)

---

$ nim -v
Nim Compiler Version 1.2.6 [Linux: amd64]

[shirleyquirk]

Duplicate of #13081, link #8007 #8015
See https://forum.nim-lang.org/t/6530 for workarounds

[ghost]

Closing as a duplicate of #13081 :)