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type MyProc* = proc() {.cdecl.}

proc testProc() {.cdecl.} = echo "Hello World"

proc callPointer(p: pointer) = 
  let function = cast[MyProc](p)
  function()

proc toPointer(function: MyProc) =
  let p: pointer = cast[pointer](function) # Error: expression cannot be cast to pointer
  callPointer(p)
  
toPointer(testProc)