25 lines
925 B
Lua
25 lines
925 B
Lua
assert(not mk_let("a", Type, Var(0), Var(0)):closed())
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local env = empty_environment()
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local A = Const("A")
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env = add_decl(env, mk_var_decl("A", Type))
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env = add_decl(env, mk_var_decl("g", mk_arrow(A, mk_arrow(A, A))))
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env = add_decl(env, mk_var_decl("f", mk_arrow(A, Bool)))
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env = add_decl(env, mk_var_decl("a", A))
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local a = Const("a")
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local b = Const("b")
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local x = Const("x")
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local y = Const("y")
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local g = Const("g")
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local f = Const("f")
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local tc = type_checker(env)
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print(Let(x, A, a, f(x)))
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print(Let(x, A, a, y, A, f(f(x)), f(x)))
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assert(Let(x, A, a, y, A, f(f(x)), f(x)) == Let({{x, A, a}, {y, A, f(f(x))}}, f(x)))
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print(Let({{x, A, a}, {y, A, g(g(x), x, a)}}, f(y)))
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local t = Let({{x, A, a}, {y, A, g(g(x), x, a)}}, f(y))
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assert(t:let_name() == name("x"))
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assert(t:let_type() == A)
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assert(t:let_value() == a)
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assert(t:let_body():is_let())
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print(tc:check(Let({{x, A, a}, {y, A, g(g(x, a), x)}}, f(y))))
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