Files
mercury/tests/valid/flatten_conj_bug.m
Peter Wang 88047bbb45 Delete Erlang from tests.
tests/general/float_test.exp3:
tests/general/float_test.m:
tests/general/read_dir_regression.exp4:
tests/general/read_dir_regression.m:
tests/hard_coded/remove_file.exp2:
tests/hard_coded/remove_file.m:
    Delete Erlang backend specific expected outputs.

tests/hard_coded/Mmakefile:
tests/hard_coded/erlang_deconstruct.exp:
tests/hard_coded/erlang_deconstruct.m:
tests/hard_coded/existential_list.exp:
tests/hard_coded/existential_list.m:
tests/valid/Mmakefile:
tests/valid/erl_ite_vars.m:
tests/valid/zf_erlang_bug.m:
    Delete erlang target specific tests.

tests/*:
    Delete Erlang foreign procs and foreign types.
2020-10-27 11:10:11 +11:00

47 lines
1.3 KiB
Mathematica

%---------------------------------------------------------------------------%
% vim: ts=4 sw=4 et ft=mercury
%---------------------------------------------------------------------------%
:- module flatten_conj_bug.
:- interface.
:- import_module list.
% A type
:- type cvar(T)
---> cvar(v :: T, x :: list(int)).
:- inst cvar
---> cvar(ground, non_empty_list).
% A typeclass.
:- typeclass cvar_type(T) where [].
:- type cvar_wrapper
---> some [T] (cvar_wrapper(cvar :: cvar(T)) => cvar_type(T)).
:- some [T] func unwrap_cvar(cvar_wrapper::in) = (cvar(T)::out(cvar)) is det
=> (cvar_type(T)).
:- implementation.
% The transformed version of this function was not able to be
% mode checked. The reason for this is that polymorphism was not
% flattening conjunctions, and the conjuncts were therefore not
% able to be scheduled in any order that would work.
%
unwrap_cvar(cvar_wrapper(V)) = unsafe_any_to_cvar(V).
:- func unsafe_any_to_cvar(cvar(T)::in) = (cvar(T)::out(cvar)) is det.
:- pragma foreign_proc("C",
unsafe_any_to_cvar(X::in) = (Y::out(cvar)),
[will_not_call_mercury, promise_pure],
"
Y = X;
").
:- pragma foreign_proc("Java",
unsafe_any_to_cvar(X::in) = (Y::out(cvar)),
[will_not_call_mercury, promise_pure],
"
Y = X;
").