Const block variable memory being reused unexpectedly

[guzba]

When using a block to initialize a const at compile time, I am seeing variables keep values from the previous scope / not be re-initialized as expected.

Run with nim c -r test.nim

const test = block:
  for i in 1 .. 5:
    var arr: array[3, int]
    var val: int
    echo arr, " ", val
    for j in 0 ..< len(arr):
      arr[j] = i
      val = i
  0

Current Output

[0, 0, 0] 0
[1, 1, 1] 1
[2, 2, 2] 2
[3, 3, 3] 3
[4, 4, 4] 4

Expected Output

[0, 0, 0] 0
[0, 0, 0] 0
[0, 0, 0] 0
[0, 0, 0] 0
[0, 0, 0] 0

Additional Information

• If you change the const to let the output is as expected.

$ nim -v
Nim Compiler Version 1.2.0 [Windows: amd64]
Compiled at 2020-04-03
Copyright (c) 2006-2020 by Andreas Rumpf

git hash: 7e83adff84be5d0c401a213eccb61e321a3fb1ff
active boot switches: -d:release

[metagn]

Same issue as #10938