Use Spanned not semi-traversable Span tuples

Cargo.lock

@@ -4545,6 +4545,7 @@ dependencies = [
  "rustc_index",
  "rustc_macros",
  "rustc_serialize",
+ "rustc_type_ir",
  "scoped-tls",
  "sha1",
  "sha2",

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -671,8 +671,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         let tcx = self.infcx.tcx;
 
         // Find out if the predicates show that the type is a Fn or FnMut
-        let find_fn_kind_from_did = |(pred, _): (ty::Clause<'tcx>, _)| {
-            if let ty::ClauseKind::Trait(pred) = pred.kind().skip_binder()
+        let find_fn_kind_from_did = |pred: ty::Spanned<ty::Clause<'tcx>>| {
+            if let ty::ClauseKind::Trait(pred) = pred.node.kind().skip_binder()
                 && pred.self_ty() == ty
             {
                 if Some(pred.def_id()) == tcx.lang_items().fn_trait() {
@@ -698,7 +698,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) => tcx
                 .explicit_item_bounds(def_id)
                 .iter_instantiated_copied(tcx, args)
-                .find_map(|(clause, span)| find_fn_kind_from_did((clause, span))),
+                .find_map(find_fn_kind_from_did),
             ty::Closure(_, args) => match args.as_closure().kind() {
                 ty::ClosureKind::Fn => Some(hir::Mutability::Not),
                 ty::ClosureKind::FnMut => Some(hir::Mutability::Mut),

compiler/rustc_borrowck/src/diagnostics/move_errors.rs

@@ -130,7 +130,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 // opt_match_place is None for let [mut] x = ... statements,
                 // whether or not the right-hand side is a place expression
                 if let LocalInfo::User(BindingForm::Var(VarBindingForm {
-                    opt_match_place: Some((opt_match_place, match_span)),
+                    opt_match_place: Some(opt_match_place),
                     binding_mode: _,
                     opt_ty_info: _,
                     pat_span: _,
@@ -143,8 +143,8 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                         original_path,
                         *move_from,
                         local,
-                        opt_match_place,
-                        match_span,
+                        opt_match_place.node,
+                        opt_match_place.span,
                         stmt_source_info.span,
                     );
                     return;

compiler/rustc_borrowck/src/type_check/canonical.rs

@@ -99,10 +99,10 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         instantiated_predicates: ty::InstantiatedPredicates<'tcx>,
         locations: Locations,
     ) {
-        for (predicate, span) in instantiated_predicates {
-            debug!(?predicate);
-            let category = ConstraintCategory::Predicate(span);
-            let predicate = self.normalize_with_category(predicate, locations, category);
+        for predicate in instantiated_predicates {
+            debug!(?predicate.node);
+            let category = ConstraintCategory::Predicate(predicate.span);
+            let predicate = self.normalize_with_category(predicate.node, locations, category);
             self.prove_predicate(predicate, locations, category);
         }
     }

compiler/rustc_codegen_llvm/src/debuginfo/create_scope_map.rs

@@ -90,13 +90,13 @@ fn make_mir_scope<'ll, 'tcx>(
     let file_metadata = file_metadata(cx, &loc.file);
 
     let parent_dbg_scope = match scope_data.inlined {
-        Some((callee, _)) => {
+        Some(callee) => {
             // FIXME(eddyb) this would be `self.monomorphize(&callee)`
             // if this is moved to `rustc_codegen_ssa::mir::debuginfo`.
             let callee = cx.tcx.instantiate_and_normalize_erasing_regions(
                 instance.args,
                 ty::ParamEnv::reveal_all(),
-                ty::EarlyBinder::bind(callee),
+                ty::EarlyBinder::bind(callee.node),
             );
             debug_context.inlined_function_scopes.entry(callee).or_insert_with(|| {
                 let callee_fn_abi = cx.fn_abi_of_instance(callee, ty::List::empty());
@@ -116,11 +116,11 @@ fn make_mir_scope<'ll, 'tcx>(
         )
     };
 
-    let inlined_at = scope_data.inlined.map(|(_, callsite_span)| {
+    let inlined_at = scope_data.inlined.map(|callee| {
         // FIXME(eddyb) this doesn't account for the macro-related
         // `Span` fixups that `rustc_codegen_ssa::mir::debuginfo` does.
-        let callsite_scope = parent_scope.adjust_dbg_scope_for_span(cx, callsite_span);
-        cx.dbg_loc(callsite_scope, parent_scope.inlined_at, callsite_span)
+        let callsite_scope = parent_scope.adjust_dbg_scope_for_span(cx, callee.span);
+        cx.dbg_loc(callsite_scope, parent_scope.inlined_at, callee.span)
     });
 
     debug_context.scopes[scope] = DebugScope {

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -1165,9 +1165,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                     // If the stacktrace passes through MIR-inlined source scopes, add them.
                     let mir::SourceInfo { mut span, scope } = *frame.body.source_info(loc);
                     let mut scope_data = &frame.body.source_scopes[scope];
-                    while let Some((instance, call_span)) = scope_data.inlined {
-                        frames.push(FrameInfo { span, instance });
-                        span = call_span;
+                    while let Some(instance) = scope_data.inlined {
+                        frames.push(FrameInfo { span, instance: instance.node });
+                        span = instance.span;
                         scope_data = &frame.body.source_scopes[scope_data.parent_scope.unwrap()];
                     }
                     span

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -1057,7 +1057,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                     tcx,
                     predicates
                         .iter()
-                        .filter_map(|(p, _)| Some(p.as_trait_clause()?.map_bound(|t| t.trait_ref))),
+                        .filter_map(|p| Some(p.node.as_trait_clause()?.map_bound(|t| t.trait_ref))),
                     assoc_name,
                 )
             },

compiler/rustc_hir_analysis/src/astconv/object_safety.rs

@@ -57,15 +57,15 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
         let mut trait_bounds = vec![];
         let mut projection_bounds = vec![];
-        for (pred, span) in bounds.clauses() {
-            let bound_pred = pred.kind();
+        for pred in bounds.clauses() {
+            let bound_pred = pred.node.kind();
             match bound_pred.skip_binder() {
                 ty::ClauseKind::Trait(trait_pred) => {
                     assert_eq!(trait_pred.polarity, ty::ImplPolarity::Positive);
-                    trait_bounds.push((bound_pred.rebind(trait_pred.trait_ref), span));
+                    trait_bounds.push((bound_pred.rebind(trait_pred.trait_ref), pred.span));
                 }
                 ty::ClauseKind::Projection(proj) => {
-                    projection_bounds.push((bound_pred.rebind(proj), span));
+                    projection_bounds.push((bound_pred.rebind(proj), pred.span));
                 }
                 ty::ClauseKind::TypeOutlives(_) => {
                     // Do nothing, we deal with regions separately

compiler/rustc_hir_analysis/src/bounds.rs

@@ -23,7 +23,7 @@ use rustc_span::Span;
 /// include the self type (e.g., `trait_bounds`) but in others we do not
 #[derive(Default, PartialEq, Eq, Clone, Debug)]
 pub struct Bounds<'tcx> {
-    pub clauses: Vec<(ty::Clause<'tcx>, Span)>,
+    pub clauses: Vec<ty::Spanned<ty::Clause<'tcx>>>,
 }
 
 impl<'tcx> Bounds<'tcx> {
@@ -33,8 +33,10 @@ impl<'tcx> Bounds<'tcx> {
         region: ty::PolyTypeOutlivesPredicate<'tcx>,
         span: Span,
     ) {
-        self.clauses
-            .push((region.map_bound(|p| ty::ClauseKind::TypeOutlives(p)).to_predicate(tcx), span));
+        self.clauses.push(ty::Spanned {
+            node: region.map_bound(|p| ty::ClauseKind::TypeOutlives(p)).to_predicate(tcx),
+            span,
+        });
     }
 
     pub fn push_trait_bound(
@@ -72,14 +74,14 @@ impl<'tcx> Bounds<'tcx> {
         span: Span,
         polarity: ty::ImplPolarity,
     ) {
-        self.clauses.push((
-            trait_ref
+        self.clauses.push(ty::Spanned {
+            node: trait_ref
                 .map_bound(|trait_ref| {
                     ty::ClauseKind::Trait(ty::TraitPredicate { trait_ref, polarity })
                 })
                 .to_predicate(tcx),
             span,
-        ));
+        });
     }
 
     pub fn push_projection_bound(
@@ -88,20 +90,20 @@ impl<'tcx> Bounds<'tcx> {
         projection: ty::PolyProjectionPredicate<'tcx>,
         span: Span,
     ) {
-        self.clauses.push((
-            projection.map_bound(|proj| ty::ClauseKind::Projection(proj)).to_predicate(tcx),
+        self.clauses.push(ty::Spanned {
+            node: projection.map_bound(|proj| ty::ClauseKind::Projection(proj)).to_predicate(tcx),
             span,
-        ));
+        });
     }
 
     pub fn push_sized(&mut self, tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) {
         let sized_def_id = tcx.require_lang_item(LangItem::Sized, Some(span));
         let trait_ref = ty::TraitRef::new(tcx, sized_def_id, [ty]);
         // Preferable to put this obligation first, since we report better errors for sized ambiguity.
-        self.clauses.insert(0, (trait_ref.to_predicate(tcx), span));
+        self.clauses.insert(0, ty::Spanned { node: trait_ref.to_predicate(tcx), span });
     }
 
-    pub fn clauses(&self) -> impl Iterator<Item = (ty::Clause<'tcx>, Span)> + '_ {
+    pub fn clauses(&self) -> impl Iterator<Item = ty::Spanned<ty::Clause<'tcx>>> + '_ {
         self.clauses.iter().cloned()
     }
 }

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -222,7 +222,7 @@ fn compare_method_predicate_entailment<'tcx>(
     hybrid_preds.predicates.extend(
         trait_m_predicates
             .instantiate_own(tcx, trait_to_placeholder_args)
-            .map(|(predicate, _)| predicate),
+            .map(|predicate| predicate.node),
     );
 
     // Construct trait parameter environment and then shift it into the placeholder viewpoint.
@@ -238,7 +238,7 @@ fn compare_method_predicate_entailment<'tcx>(
     debug!("compare_impl_method: caller_bounds={:?}", param_env.caller_bounds());
 
     let impl_m_own_bounds = impl_m_predicates.instantiate_own(tcx, impl_to_placeholder_args);
-    for (predicate, span) in impl_m_own_bounds {
+    for ty::Spanned { node: predicate, span } in impl_m_own_bounds {
         let normalize_cause = traits::ObligationCause::misc(span, impl_m_def_id);
         let predicate = ocx.normalize(&normalize_cause, param_env, predicate);
 
@@ -691,7 +691,7 @@ pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
         .instantiate_identity(tcx)
         .into_iter()
         .chain(tcx.predicates_of(trait_m.def_id).instantiate_own(tcx, trait_to_placeholder_args))
-        .map(|(clause, _)| clause);
+        .map(|clause| clause.node);
     let param_env = ty::ParamEnv::new(tcx.mk_clauses_from_iter(hybrid_preds), Reveal::UserFacing);
     let param_env = traits::normalize_param_env_or_error(
         tcx,
@@ -1009,7 +1009,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ImplTraitInTraitCollector<'_, 'tcx> {
             });
             self.types.insert(proj.def_id, (infer_ty, proj.args));
             // Recurse into bounds
-            for (pred, pred_span) in self
+            for ty::Spanned { node: pred, span: pred_span } in self
                 .interner()
                 .explicit_item_bounds(proj.def_id)
                 .iter_instantiated_copied(self.interner(), proj.args)
@@ -1963,7 +1963,7 @@ fn compare_const_predicate_entailment<'tcx>(
     hybrid_preds.predicates.extend(
         trait_ct_predicates
             .instantiate_own(tcx, trait_to_impl_args)
-            .map(|(predicate, _)| predicate),
+            .map(|predicate| predicate.node),
     );
 
     let param_env = ty::ParamEnv::new(tcx.mk_clauses(&hybrid_preds.predicates), Reveal::UserFacing);
@@ -1977,7 +1977,7 @@ fn compare_const_predicate_entailment<'tcx>(
     let ocx = ObligationCtxt::new(&infcx);
 
     let impl_ct_own_bounds = impl_ct_predicates.instantiate_own(tcx, impl_args);
-    for (predicate, span) in impl_ct_own_bounds {
+    for ty::Spanned { node: predicate, span } in impl_ct_own_bounds {
         let cause = ObligationCause::misc(span, impl_ct_def_id);
         let predicate = ocx.normalize(&cause, param_env, predicate);
 
@@ -2098,7 +2098,7 @@ fn compare_type_predicate_entailment<'tcx>(
     hybrid_preds.predicates.extend(
         trait_ty_predicates
             .instantiate_own(tcx, trait_to_impl_args)
-            .map(|(predicate, _)| predicate),
+            .map(|predicate| predicate.node),
     );
 
     debug!("compare_type_predicate_entailment: bounds={:?}", hybrid_preds);
@@ -2112,7 +2112,7 @@ fn compare_type_predicate_entailment<'tcx>(
 
     debug!("compare_type_predicate_entailment: caller_bounds={:?}", param_env.caller_bounds());
 
-    for (predicate, span) in impl_ty_own_bounds {
+    for ty::Spanned { node: predicate, span } in impl_ty_own_bounds {
         let cause = ObligationCause::misc(span, impl_ty_def_id);
         let predicate = ocx.normalize(&cause, param_env, predicate);
 
@@ -2210,9 +2210,14 @@ pub(super) fn check_type_bounds<'tcx>(
     let obligations: Vec<_> = tcx
         .explicit_item_bounds(trait_ty.def_id)
         .iter_instantiated_copied(tcx, rebased_args)
-        .map(|(concrete_ty_bound, span)| {
-            debug!("check_type_bounds: concrete_ty_bound = {:?}", concrete_ty_bound);
-            traits::Obligation::new(tcx, mk_cause(span), param_env, concrete_ty_bound)
+        .map(|concrete_ty_bound| {
+            debug!("check_type_bounds: concrete_ty_bound = {:?}", concrete_ty_bound.node);
+            traits::Obligation::new(
+                tcx,
+                mk_cause(concrete_ty_bound.span),
+                param_env,
+                concrete_ty_bound.node,
+            )
         })
         .collect();
     debug!("check_type_bounds: item_bounds={:?}", obligations);

compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs

@@ -123,7 +123,7 @@ pub(super) fn check_refining_return_position_impl_trait_in_trait<'tcx>(
         .instantiate_identity(tcx)
         .into_iter()
         .chain(tcx.predicates_of(trait_m.def_id).instantiate_own(tcx, trait_m_to_impl_m_args))
-        .map(|(clause, _)| clause);
+        .map(|clause| clause.node);
     let param_env = ty::ParamEnv::new(tcx.mk_clauses_from_iter(hybrid_preds), Reveal::UserFacing);
     let param_env = normalize_param_env_or_error(tcx, param_env, ObligationCause::dummy());
 
@@ -193,14 +193,14 @@ pub(super) fn check_refining_return_position_impl_trait_in_trait<'tcx>(
     // too, since we *do not* use the trait solver to prove that the RPITIT's
     // bounds are not stronger -- we're doing a simple, syntactic compatibility
     // check between bounds. This is strictly forwards compatible, though.
-    for (clause, span) in impl_bounds {
-        if !trait_bounds.contains(&clause) {
+    for clause in impl_bounds {
+        if !trait_bounds.contains(&clause.node) {
             report_mismatched_rpitit_signature(
                 tcx,
                 trait_m_sig_with_self_for_diag,
                 trait_m.def_id,
                 impl_m.def_id,
-                Some(span),
+                Some(clause.span),
             );
             return;
         }
@@ -220,12 +220,12 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ImplTraitInTraitCollector<'tcx> {
             && self.tcx.is_impl_trait_in_trait(proj.def_id)
         {
             if self.types.insert(proj) {
-                for (pred, _) in self
+                for pred in self
                     .tcx
                     .explicit_item_bounds(proj.def_id)
                     .iter_instantiated_copied(self.tcx, proj.args)
                 {
-                    pred.visit_with(self)?;
+                    pred.node.visit_with(self)?;
                 }
             }
             ControlFlow::Continue(())
@@ -267,7 +267,7 @@ fn report_mismatched_rpitit_signature<'tcx>(
         let Some(future_output_ty) = tcx
             .explicit_item_bounds(future_ty.def_id)
             .iter_instantiated_copied(tcx, future_ty.args)
-            .find_map(|(clause, _)| match clause.kind().no_bound_vars()? {
+            .find_map(|clause| match clause.node.kind().no_bound_vars()? {
                 ty::ClauseKind::Projection(proj) => proj.term.ty(),
                 _ => None,
             })

compiler/rustc_hir_analysis/src/check/dropck.rs

@@ -132,7 +132,9 @@ fn ensure_drop_predicates_are_implied_by_item_defn<'tcx>(
     let param_env =
         ty::EarlyBinder::bind(tcx.param_env(adt_def_id)).instantiate(tcx, adt_to_impl_args);
 
-    for (pred, span) in tcx.predicates_of(drop_impl_def_id).instantiate_identity(tcx) {
+    for ty::Spanned { node: pred, span } in
+        tcx.predicates_of(drop_impl_def_id).instantiate_identity(tcx)
+    {
         let normalize_cause = traits::ObligationCause::misc(span, adt_def_id);
         let pred = ocx.normalize(&normalize_cause, param_env, pred);
         let cause = traits::ObligationCause::new(span, adt_def_id, traits::DropImpl);

compiler/rustc_hir_analysis/src/check/mod.rs

@@ -305,13 +305,13 @@ fn default_body_is_unstable(
 /// Re-sugar `ty::GenericPredicates` in a way suitable to be used in structured suggestions.
 fn bounds_from_generic_predicates<'tcx>(
     tcx: TyCtxt<'tcx>,
-    predicates: impl IntoIterator<Item = (ty::Clause<'tcx>, Span)>,
+    predicates: impl IntoIterator<Item = ty::Spanned<ty::Clause<'tcx>>>,
 ) -> (String, String) {
     let mut types: FxHashMap<Ty<'tcx>, Vec<DefId>> = FxHashMap::default();
     let mut projections = vec![];
-    for (predicate, _) in predicates {
-        debug!("predicate {:?}", predicate);
-        let bound_predicate = predicate.kind();
+    for predicate in predicates {
+        debug!("predicate {:?}", predicate.node);
+        let bound_predicate = predicate.node.kind();
         match bound_predicate.skip_binder() {
             ty::ClauseKind::Trait(trait_predicate) => {
                 let entry = types.entry(trait_predicate.self_ty()).or_default();
@@ -382,7 +382,7 @@ fn fn_sig_suggestion<'tcx>(
     tcx: TyCtxt<'tcx>,
     sig: ty::FnSig<'tcx>,
     ident: Ident,
-    predicates: impl IntoIterator<Item = (ty::Clause<'tcx>, Span)>,
+    predicates: impl IntoIterator<Item = ty::Spanned<ty::Clause<'tcx>>>,
     assoc: ty::AssocItem,
 ) -> String {
     let args = sig
@@ -429,7 +429,7 @@ fn fn_sig_suggestion<'tcx>(
         output = if let ty::Alias(_, alias_ty) = *output.kind() {
             tcx.explicit_item_bounds(alias_ty.def_id)
                 .iter_instantiated_copied(tcx, alias_ty.args)
-                .find_map(|(bound, _)| bound.as_projection_clause()?.no_bound_vars()?.term.ty())
+                .find_map(|bound| bound.node.as_projection_clause()?.no_bound_vars()?.term.ty())
                 .unwrap_or_else(|| {
                     span_bug!(
                         ident.span,