-- main.mcl --
import "fmt"
# unfortunately, for now `in` is a reserved keyword, see:
# https://github.com/purpleidea/mgmt/issues/728
$map = 55
$fn = func($in) { # in is a special keyword
	13
}
test fmt.printf("%d", $fn(0)) {}
func fn($in) { # in is a special keyword
	42 + $map
}
test fmt.printf("%d", $fn(0)) {}
test fmt.printf("%d", fn(0)) {}
-- OUTPUT --
# err: errLexParse: parser: `syntax error: unexpected IN, expecting MAP_IDENTIFIER or IDENTIFIER` @5:2