diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/librustc/traits/project.rs | 58 |
1 files changed, 1 insertions, 57 deletions
diff --git a/src/librustc/traits/project.rs b/src/librustc/traits/project.rs index 4c338219ffb..a67188713c6 100644 --- a/src/librustc/traits/project.rs +++ b/src/librustc/traits/project.rs @@ -218,10 +218,7 @@ fn project_and_unify_type<'cx, 'gcx, 'tcx>( obligation.cause.clone(), obligation.recursion_depth) { Some(n) => n, - None => { - consider_unification_despite_ambiguity(selcx, obligation); - return Ok(None); - } + None => return Ok(None), }; debug!("project_and_unify_type: normalized_ty={:?} obligations={:?}", @@ -240,59 +237,6 @@ fn project_and_unify_type<'cx, 'gcx, 'tcx>( } } -fn consider_unification_despite_ambiguity<'cx, 'gcx, 'tcx>( - selcx: &mut SelectionContext<'cx, 'gcx, 'tcx>, - obligation: &ProjectionObligation<'tcx>) -{ - debug!("consider_unification_despite_ambiguity(obligation={:?})", - obligation); - - let def_id = obligation.predicate.projection_ty.trait_ref.def_id; - match selcx.tcx().lang_items.fn_trait_kind(def_id) { - Some(_) => { } - None => { return; } - } - - let infcx = selcx.infcx(); - let self_ty = obligation.predicate.projection_ty.trait_ref.self_ty(); - let self_ty = infcx.shallow_resolve(self_ty); - debug!("consider_unification_despite_ambiguity: self_ty.sty={:?}", - self_ty.sty); - match self_ty.sty { - ty::TyClosure(closure_def_id, substs) => { - let closure_typer = selcx.closure_typer(); - let closure_type = closure_typer.closure_type(closure_def_id, substs); - let ty::Binder((_, ret_type)) = - infcx.tcx.closure_trait_ref_and_return_type(def_id, - self_ty, - &closure_type.sig, - util::TupleArgumentsFlag::No); - // We don't have to normalize the return type here - this is only - // reached for TyClosure: Fn inputs where the closure kind is - // still unknown, which should only occur in typeck where the - // closure type is already normalized. - let (ret_type, _) = - infcx.replace_late_bound_regions_with_fresh_var( - obligation.cause.span, - infer::AssocTypeProjection(obligation.predicate.projection_ty.item_name), - &ty::Binder(ret_type)); - - debug!("consider_unification_despite_ambiguity: ret_type={:?}", - ret_type); - let origin = TypeOrigin::RelateOutputImplTypes(obligation.cause.span); - let obligation_ty = obligation.predicate.ty; - match infcx.eq_types(true, origin, obligation_ty, ret_type) { - Ok(InferOk { obligations, .. }) => { - // FIXME(#32730) propagate obligations - assert!(obligations.is_empty()); - } - Err(_) => { /* ignore errors */ } - } - } - _ => { } - } -} - /// Normalizes any associated type projections in `value`, replacing /// them with a fully resolved type where possible. The return value /// combines the normalized result and any additional obligations that |