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Estimated hours taken: 5 Branches: main Avoid bug #54. compiler/follow_code.m: Don't move existentially typed deconstructions into branched control structures. If they were moved, there would be more than one origin for the type(class)_infos produced by the deconstruction, and the rtti_varmaps structure is not able to handle this. tests/hard_coded/Mmakefile: tests/hard_coded/follow_code_bug.exp: tests/hard_coded/follow_code_bug.m: tests/hard_coded/follow_code_bug_2.exp: tests/hard_coded/follow_code_bug_2.m: Two new test cases.
81 lines
1.7 KiB
Mathematica
81 lines
1.7 KiB
Mathematica
% vim: ts=4 sw=4 et
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:- module follow_code_bug_2.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- import_module string.
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main(!IO) :-
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create_exist_data(int_data, IntData),
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output_exist_data(IntData, !IO),
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create_exist_data(string_data, StringData),
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output_exist_data(StringData, !IO),
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create_exist_data(foo_data, FooData),
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output_exist_data(FooData, !IO).
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:- type data_type
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---> int_data
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; string_data
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; foo_data.
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:- type foo
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---> foo.
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:- some [T] pred create_exist_data(data_type::in, T::out) is det => data(T).
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create_exist_data(Type, ExistData) :-
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(
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Type = int_data,
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create_int_data(Data)
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;
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Type = string_data,
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create_string_data(Data)
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;
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Type = foo_data,
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create_foo_data(Data)
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),
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Data = data(ExistData).
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:- pred create_int_data(data::out) is det.
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create_int_data(Data) :-
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Data = 'new data'(41).
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:- pred create_string_data(data::out) is det.
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create_string_data(Data) :-
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Data = 'new data'("forty-one").
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:- pred create_foo_data(data::out) is det.
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create_foo_data(Data) :-
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Data = 'new data'(foo).
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:- pred output_exist_data(T::in, io::di, io::uo) is det <= data(T).
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output_exist_data(ExistData, !IO) :-
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Str = to_string(ExistData),
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io.write_string(Str, !IO),
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io.nl(!IO).
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:- type data
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---> some [T] data(T) => data(T).
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:- typeclass data(T) where [
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func to_string(T) = string
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].
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:- instance data(int) where [
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(to_string(N) = int_to_string(N))
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].
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:- instance data(string) where [
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(to_string(S) = S)
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].
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:- instance data(foo) where [
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(to_string(_) = "foo")
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].
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