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Make opposite_variance a separate function

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This commit is contained in:
Gaith Hallak 2022-02-24 15:52:17 +04:00
parent 918346445f
commit b9af3dbe7f
1 changed files with 7 additions and 8 deletions
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15
src/aeso_ast_infer_types.erl
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@ -1196,6 +1196,11 @@ arrows_in_type({fun_t, _, [], [_Arg], FRes}) ->
arrows_in_type(_) ->
0.
opposite_variance(invariant) -> invariant;
opposite_variance(covariant) -> contravariant;
opposite_variance(contravariant) -> covariant;
opposite_variance(bivariant) -> bivariant.
check_usings(Env, []) ->
Env;
check_usings(Env = #env{ used_namespaces = UsedNamespaces }, [{using, Ann, Con, Alias, Parts} | Rest]) ->
@ -2771,14 +2776,8 @@ unify1(_Env, {fun_t, _, _, var_args, _}, {fun_t, _, _, _, _}, _Variance, When) -
type_error({unify_varargs, When});
unify1(Env, {fun_t, _, Named1, Args1, Result1}, {fun_t, _, Named2, Args2, Result2}, Variance, When)
when length(Args1) == length(Args2) ->
OppositeVariance = case Variance of
invariant -> invariant;
covariant -> contravariant;
contravariant -> covariant;
bivariant -> bivariant
end,
unify0(Env, Named1, Named2, OppositeVariance, When) andalso
unify0(Env, Args1, Args2, OppositeVariance, When) andalso
unify0(Env, Named1, Named2, opposite_variance(Variance), When) andalso
unify0(Env, Args1, Args2, opposite_variance(Variance), When) andalso
unify0(Env, Result1, Result2, Variance, When);
unify1(Env, {app_t, _, {Tag, _, F}, Args1}, {app_t, _, {Tag, _, F}, Args2}, Variance, When)
when length(Args1) == length(Args2), Tag == id orelse Tag == qid ->