toSeq / mapIt result cannot be assigned to const

[etan-status]

Description

import std/sequtils

proc f(a: static openArray[int]) =
  const s1 = a.mapIt(it)
  const s2 = a.toSeq()

f([1,2,3])

Nim Version

% nim -v
Nim Compiler Version 2.0.14 [MacOSX: arm64]
Compiled at 2025-01-06
Copyright (c) 2006-2023 by Andreas Rumpf

git hash: bf4de6a
active boot switches: -d:release

Current Output

/Users/etan/Documents/Repos/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/pure/collections/sequtils.nim(1024, 13) Error: cannot evaluate at compile time: i`gensym0

Expected Output

Successful compile, no output

Known Workarounds

• wrap toSeq / mapIt invocation in another proc then assign the output of that proc to the const
• use let instead of const and put the const at caller site

Additional Information

No response

[metagn]

Consequence of #8758 #10828 etc