discard """ output: '''10 10 10 3 3 noReturn 6 calling mystuff yes calling mystuff yes ''' """ import future, macros proc twoParams(x: (int, int) -> int): int = result = x(5, 5) proc oneParam(x: int -> int): int = x(5) proc noParams(x: () -> int): int = result = x() proc noReturn(x: () -> void) = x() proc doWithOneAndTwo(f: (int, int) -> int): int = f(1,2) echo twoParams(proc (a, b: auto): auto = a + b) echo twoParams((x, y) => x + y) echo oneParam(x => x+5) echo noParams(() => 3) echo doWithOneAndTwo((x, y) => x + y) noReturn((() -> void) => echo("noReturn")) proc pass2(f: (int, int) -> int): (int) -> int = ((x: int) -> int) => f(2, x) echo pass2((x, y) => x + y)(4) proc register(name: string; x: proc()) = echo "calling ", name x() register("mystuff", proc () = echo "yes" ) proc helper(x: NimNode): NimNode = if x.kind == nnkProcDef: result = copyNimTree(x) result[0] = newEmptyNode() result = newCall("register", newLit($x[0]), result) else: result = copyNimNode(x) for i in 0..