exportc procedures in other procedures can get deleted

[Menduist]

Description

proc heya* =
  proc zzz {.exportc.} =
    echo "yey"
    
heya()
proc zzz {.importc.}
zzz()

Nim Version

d73fff1

Current Output

@mtestb.nim.c:(.text+0x230): undefined reference to `zzz'

Expected Output

Compiles

Possible Solution

My use case is that zzz is generated by a macro, but not a closure, so it can be called from C safely.
Cannot add * to prevent deletion by the compiler as this is not a top level procedure

Workaround:

proc heya* =
  proc zzz {.exportc.} =
    echo "yey"
  if false: zzz()
    
heya()
proc zzz {.importc.}
zzz()

Additional Information

No response