31 lines
1 KiB
Lua
31 lines
1 KiB
Lua
function test_unify(env, lhs, rhs, num_s)
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print(tostring(lhs) .. " =?= " .. tostring(rhs) .. ", expected: " .. tostring(num_s))
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local ss = unify(env, lhs, rhs)
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local n = 0
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for s in ss do
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print("solution: ")
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s:for_each_expr(function(n, v, j)
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print(" " .. tostring(n) .. " := " .. tostring(v))
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end)
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s:for_each_level(function(n, v, j)
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print(" " .. tostring(n) .. " := " .. tostring(v))
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end)
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n = n + 1
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end
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assert(num_s == n)
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end
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local env = environment()
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env = add_decl(env, mk_var_decl("N", Type))
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local N = Const("N")
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env = add_decl(env, mk_var_decl("f", mk_arrow(N, N, N)))
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env = add_decl(env, mk_var_decl("a", N))
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local f = Const("f")
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local a = Const("a")
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local l1 = mk_local("l1", "x", N)
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local l2 = mk_local("l2", "y", N)
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local l3 = mk_local("l3", "z", N)
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local m = mk_metavar("m", mk_arrow(N, N, N))
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test_unify(env, m(l1, l2), f(f(a, l1), l1), 1)
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test_unify(env, f(m(l1, l2), l1), f(f(a, l1), l1), 1)
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test_unify(env, f(m(l1, l2), a), f(f(a, l1), l1), 0)
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