Consts that call templates cannot evaluate whilst in procedure bodies

[awr1]

import std / sequtils
type SomeEnum = enum
  Foo = "foo", Bar, Baz
proc someProc() =
  const y = SomeEnum.toSeq

fails with:

sequtils.nim(623, 9) Error: cannot evaluate at compile time: result`gensym144407

However, the following passes compilation:

import std / sequtils
type SomeEnum = enum
  Foo = "foo", Bar, Baz
const x = SomeEnum.toSeq 

[juancarlospaco]

Can repro.

[timotheecour]

@awr1 the title needs to be changed, see reduced example below:

when true: # D20200508T215154:here gitissue
  template fun(): untyped =
    var c = 0
    c

  proc main() =
    const c = fun()

  main()

[awr1]

@timotheecour Done

[timotheecour]

this sounds like an exact duplicate of #12172, see #12172 (comment)