return n

	case ir.OFOR:
		n := n.(*ir.ForStmt)
		return tcFor(n)

	case ir.OIF:
		n := n.(*ir.IfStmt)
		return tcIf(n)

	case ir.ORETURN:
		n := n.(*ir.ReturnStmt)
		return tcReturn(n)

	case ir.OTAILCALL:
		n := n.(*ir.TailCallStmt)
		n.Call = typecheck(n.Call, ctxStmt|ctxExpr).(*ir.CallExpr)
		return n

	case ir.OCHECKNIL:
		n := n.(*ir.UnaryExpr)
		return tcCheckNil(n)

		} elsif($type eq "string" && $errvar ne "") {
			$text .= "\tvar _p$n *byte\n";
			$text .= "\t_p$n, $errvar = BytePtrFromString($name)\n";
			$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
			push @args, "uintptr(unsafe.Pointer(_p$n))";
			$n++;
		} elsif($type eq "string") {
			print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
			$text .= "\tvar _p$n *byte\n";

			fmt.Fprint(fgo2, "\tif e != 0 {\n")
			fmt.Fprint(fgo2, "\t\treturn ")
			if !void {
				fmt.Fprint(fgo2, "r, ")
			}
			fmt.Fprint(fgo2, "e\n")
			fmt.Fprint(fgo2, "\t}\n")
			fmt.Fprint(fgo2, "\treturn ")
			if !void {
				fmt.Fprint(fgo2, "r, ")
			}
			fmt.Fprint(fgo2, "nil\n")
		} else if !void {
			fmt.Fprint(fgo2, "\treturn r\n")
		}

		fmt.Fprint(fgo2, "}\n")

    final SettableFuture<Object> toReturn = SettableFuture.create();
    AsyncFunction<Object, Object> function =
        tagged(
            "Called my toString",
            new AsyncFunction<Object, Object>() {
              @Override
              public ListenableFuture<Object> apply(Object input) throws Exception {
                return toReturn;
              }
            });

    final SettableFuture<Object> toReturn = SettableFuture.create();
    AsyncFunction<Object, Object> function =
        tagged(
            "Called my toString",
            new AsyncFunction<Object, Object>() {
              @Override
              public ListenableFuture<Object> apply(Object input) throws Exception {
                return toReturn;
              }
            });