Capturing any parameter of a typed macro in a closure will cause it to evaluate to nil

[alaviss]

Example

import macros

func run(fn: proc()) = fn()

macro foo(T: typed): untyped =
  proc bar() =
    echo repr T
  run(bar)
  echo repr T
 
foo(int)

Current Output

nil
nil

Expected Output

int
int

Additional Information

• This can be workaround by shadowing the parameter before the closure declaration

$ nim -v
Nim Compiler Version 1.5.1 [Linux: amd64]
Compiled at 2021-06-24
Copyright (c) 2006-2021 by Andreas Rumpf

git hash: 0f91b67f5c15328330f74a8769aed9961940aab2
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