24 lines
796 B
Lua
24 lines
796 B
Lua
local env = environment()
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local N = Const("N")
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env = add_decl(env, mk_var_decl("N", Type))
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env = add_decl(env, mk_var_decl("f", mk_arrow(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 m1 = mk_metavar("m1", mk_metavar("m2", mk_sort(mk_meta_univ("l"))))
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local ngen = name_generator("tst")
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local tc = type_checker(env, ngen)
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assert(tc:num_scopes() == 0)
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tc:push()
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assert(tc:num_scopes() == 1)
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print(tc:check(f(m1)))
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assert(tc:next_cnstr())
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assert(not tc:next_cnstr())
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print(tc:check(f(f(m1))))
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assert(not tc:next_cnstr()) -- New constraint is not generated
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tc:pop() -- forget that we checked f(m1)
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print(tc:check(f(m1)))
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-- constraint is generated again
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assert(tc:next_cnstr())
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assert(not tc:next_cnstr())
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check_error(function() tc:pop() end)
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