let t=s.mapIt(it) gives Error: redefinition of 't'

[timotheecour]

#[
BUG:
/Users/timothee/git_clone/nim/timn/bugs/stdlib/t01_mapIt_redefinition_of_t.nim(6, 1) template/generic instantiation from here
/Users/timothee/git_clone/nim/timn/bugs/stdlib/t01_mapIt_redefinition_of_t.nim(9, 9) Error: redefinition of 't'
]#

import sequtils

when defined(case1):
  proc test() =
    # BUG
    let t = [1,2].mapIt(it)

test()

@judofyr LemonBoy is there a better fix than changing t to something rare in implementation of mapIt?