[
(src: "{{~foo~}}", exp: [(Expr((true, true), (("foo"), (lo:3, hi:6))), (lo: 0, hi:9))]),
(src: "{{~ foo~}}", exp: [(Expr((true, true), (("foo"), (lo:4, hi:7))), (lo: 0, hi:10))]),
(src: "{{~ foo}}", exp: [(Expr((true, false), (("foo"), (lo:4, hi:7))), (lo: 0, hi:9))]),
(src: "{{foo ~}}", exp: [(Expr((false, true), (("foo"), (lo:2, hi:5))), (lo: 0, hi:11))]),
(src: "{{~{foo }~}}", exp: [(Safe((true, true), (("foo"), (lo:4, hi:7))), (lo: 0, hi:12))]),
(src: "{{{foo }~}}", exp: [(Safe((false, true), (("foo"), (lo:3, hi:6))), (lo: 0, hi:11))]),
]