30 lines
1.1 KiB
Lua
30 lines
1.1 KiB
Lua
import("util.lua")
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local f, g, a, b, c, x = Consts("f, g, a, b, c, x")
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local m1 = mk_metavar("m1")
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local m2 = mk_metavar("m2")
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local m3 = mk_metavar("m3")
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local s = fo_unify(f(m1, g(m2, c)), f(g(m2, a), g(m3, m3)))
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assert(s)
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assert(#s == 3)
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assert(s:find(m2) == c)
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assert(s:apply(f(m1, g(m2, c))) == s:apply(f(g(m2, a), g(m3, m3))))
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assert(not fo_unify(f(a), g(m2)))
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function must_unify(t1, t2)
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local s = fo_unify(t1, t2)
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assert(s)
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print(t1, t2, s:apply(t1))
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assert(s:apply(t1) == s:apply(t2))
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end
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Bool = Const("Bool")
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must_unify(Type(), m1)
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must_unify(fun(x, Bool, x), fun(x, Bool, m1))
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must_unify(Pi(x, Bool, x), Pi(x, Bool, m1))
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must_unify(Var(0), m1)
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must_unify(f(m1, m2, m3), f(m1, m1, m2))
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must_unify(mk_let("x", f(b), Var(0)), mk_let("y", f(m1), Var(0)))
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assert(not fo_unify(mk_let("x", Bool, f(b), Var(0)), mk_let("y", f(m1), Var(0))))
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assert(not fo_unify(mk_let("x", f(b), Var(0)), mk_let("y", Bool, f(m1), Var(0))))
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must_unify(mk_let("x", Bool, f(b), Var(0)), mk_let("y", Bool, f(m1), Var(0)))
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assert(not fo_unify(mk_let("x", Bool, f(b), Var(0)), fun(x, Bool, x)))
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must_unify(iVal(10), m1)
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must_unify(iVal(10), iVal(10))
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