Files
mercury/tests/valid/exists_bug.m
Zoltan Somogyi fdd141bf77 Clean up the tests in the other test directories.
tests/invalid/*.{m,err_exp}:
tests/misc_tests/*.m:
tests/mmc_make/*.m:
tests/par_conj/*.m:
tests/purity/*.m:
tests/stm/*.m:
tests/string_format/*.m:
tests/structure_reuse/*.m:
tests/submodules/*.m:
tests/tabling/*.m:
tests/term/*.m:
tests/trailing/*.m:
tests/typeclasses/*.m:
tests/valid/*.m:
tests/warnings/*.{m,exp}:
    Make these tests use four-space indentation, and ensure that
    each module is imported on its own line. (I intend to use the latter
    to figure out which subdirectories' tests can be executed in parallel.)

    These changes usually move code to different lines. For the tests
    that check compiler error messages, expect the new line numbers.

browser/cterm.m:
browser/tree234_cc.m:
    Import only one module per line.

tests/hard_coded/boyer.m:
    Fix something I missed.
2015-02-16 12:32:18 +11:00

29 lines
792 B
Mathematica

%---------------------------------------------------------------------------%
% vim: ts=4 sw=4 et ft=mercury
%---------------------------------------------------------------------------%
:- module exists_bug.
:- interface.
:- typeclass bar(T) where [].
:- some [T] pred new_bar(T::out) is det => bar(T).
:- implementation.
:- instance bar(foo(S)) where [].
new_bar(T) :-
% There was a bug here: polymorphism.m was attempting to construct
% a type_info for the existentially quantified type variable of
% new_foo/1. It was doing this because there was a type_info_locn
% (pointing inside the typeclass_info, which doesn't get constructed
% until later).
new_foo(T).
:- type foo(S)
---> f(S).
:- some [S] pred new_foo(foo(S)::out) is det.
new_foo(f(1)).