mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-21 04:13:46 +00:00
44 lines
1.1 KiB
Mathematica
44 lines
1.1 KiB
Mathematica
%---------------------------------------------------------------------------%
|
|
% vim: ts=4 sw=4 et ft=mercury
|
|
%---------------------------------------------------------------------------%
|
|
%
|
|
% Regression test:
|
|
%
|
|
% This program uses a higher order function. Due to the way higher order
|
|
% types are represented as terms (which is quite different from any
|
|
% other type) manipulations of types that don't take this into account
|
|
% would make mistakes.
|
|
%
|
|
% The Mercury compiler of 20 December, 1996 failed to compile this,
|
|
% giving link errors.
|
|
%
|
|
|
|
:- module ho_func_reg.
|
|
|
|
:- interface.
|
|
|
|
:- import_module int.
|
|
:- import_module io.
|
|
|
|
:- pred main(io::di, io::uo) is det.
|
|
|
|
:- type bar == (func(int) = int).
|
|
:- inst bar == (func(in) = out is det).
|
|
|
|
:- func foo(bar, int) = int.
|
|
:- mode foo(in(bar), in) = out is det.
|
|
|
|
:- func next(int) = int.
|
|
|
|
:- implementation.
|
|
|
|
main(!IO) :-
|
|
io.write_string("I seem to have compiled ok.\n", !IO),
|
|
Eight = foo(next, 7),
|
|
io.write_int(Eight, !IO),
|
|
io.write_string(" seems to be the answer\n", !IO).
|
|
|
|
next(I) = I + 1.
|
|
|
|
foo(F, I) = apply(F, I).
|