dynprocptr.nim

## lib.nim #########
proc test1(): string {.exportc, dynlib .}=
  result = "test"

## user.nim ########
import dynlib, osproc

# compile libs so I don't have to do it by hand
let l1 = execCmd("nim c --app:lib lib.nim")

# load the lib
let lib = loadLib("lib.dll")

# get a pointer to the proc in lib.nim
let testptr = lib.checkedsymAddr("test1")

#error: request for member 'ClEnv' in something not a structure or union
var testderef = cast[proc():string](testptr) 
echo testderef() # 

# SIGSEGV
var testderef2 = cast[ptr proc():string](testptr)[]
echo testderef2()  

Changing var testderef = cast[proc():string](testptr) to
var testderef = cast[proc():string {.cdecl.}](testptr) works.