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Estimated hours taken: 0.1 tests/hard_coded/ho_func_reg.m Fix some errors in the function declarations found by Fergus' recent changes to prog_io.m.
42 lines
864 B
Mathematica
42 lines
864 B
Mathematica
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% Regression test:
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%
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% This program uses a higher order function. Due to the way higher order
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% types are represented as terms (which is quite different from any
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% other type) manipulations of types that don't take this into account
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% would make mistakes.
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%
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% The Mercury compiler of 20 December, 1996 failed to compile this,
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% giving link errors.
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:- module ho_func_reg.
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:- interface.
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:- import_module int, io.
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:- pred main(io__state::di, io__state::uo) is det.
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:- type bar == (func(int) = int).
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:- inst bar = (func(in) = out is det).
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:- func foo(bar, int) = int.
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:- mode foo(in(bar), in) = out is det.
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:- func next(int) = int.
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:- implementation.
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main -->
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io__write_string("I seem to have compiled ok.\n"),
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{ Eight = foo(next, 7) },
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io__write_int(Eight),
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io__write_string(" seems to be the answer\n").
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next(I) = I + 1.
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foo(F, I) = apply(F, I).
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