Add Option<Span> to require_lang_item

src/librustc/infer/mod.rs

@@ -1460,7 +1460,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             }
         }
 
-        let copy_def_id = self.tcx.require_lang_item(lang_items::CopyTraitLangItem);
+        let copy_def_id = self.tcx.require_lang_item(lang_items::CopyTraitLangItem, None);
 
         // this can get called from typeck (by euv), and moves_by_default
         // rightly refuses to work with inference variables, but

src/librustc/middle/lang_items.rs

@@ -381,9 +381,13 @@ language_item_table! {
 impl<'tcx> TyCtxt<'tcx> {
     /// Returns the `DefId` for a given `LangItem`.
     /// If not found, fatally abort compilation.
-    pub fn require_lang_item(&self, lang_item: LangItem) -> DefId {
+    pub fn require_lang_item(&self, lang_item: LangItem, span: Option<Span>) -> DefId {
         self.lang_items().require(lang_item).unwrap_or_else(|msg| {
+            if let Some(span) = span {
+                self.sess.span_fatal(span, &msg)
+            } else {
                 self.sess.fatal(&msg)
+            }
         })
     }
 }

src/librustc/traits/select.rs

@@ -3513,7 +3513,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
 
                 // We can only make objects from sized types.
                 let tr = ty::TraitRef {
-                    def_id: tcx.require_lang_item(lang_items::SizedTraitLangItem),
+                    def_id: tcx.require_lang_item(lang_items::SizedTraitLangItem, None),
                     substs: tcx.mk_substs_trait(source, &[]),
                 };
                 nested.push(predicate_to_obligation(tr.to_predicate()));

src/librustc/ty/context.rs

@@ -2385,13 +2385,13 @@ impl<'tcx> TyCtxt<'tcx> {
 
     #[inline]
     pub fn mk_box(self, ty: Ty<'tcx>) -> Ty<'tcx> {
-        let def_id = self.require_lang_item(lang_items::OwnedBoxLangItem);
+        let def_id = self.require_lang_item(lang_items::OwnedBoxLangItem, None);
         self.mk_generic_adt(def_id, ty)
     }
 
     #[inline]
     pub fn mk_maybe_uninit(self, ty: Ty<'tcx>) -> Ty<'tcx> {
-        let def_id = self.require_lang_item(lang_items::MaybeUninitLangItem);
+        let def_id = self.require_lang_item(lang_items::MaybeUninitLangItem, None);
         self.mk_generic_adt(def_id, ty)
     }
 

src/librustc/ty/instance.rs

@@ -327,7 +327,7 @@ impl<'tcx> Instance<'tcx> {
     }
 
     pub fn resolve_drop_in_place(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> ty::Instance<'tcx> {
-        let def_id = tcx.require_lang_item(DropInPlaceFnLangItem);
+        let def_id = tcx.require_lang_item(DropInPlaceFnLangItem, None);
         let substs = tcx.intern_substs(&[ty.into()]);
         Instance::resolve(tcx, ty::ParamEnv::reveal_all(), def_id, substs).unwrap()
     }

src/librustc/ty/mod.rs

@@ -2588,12 +2588,12 @@ impl<'tcx> ClosureKind {
 
     pub fn trait_did(&self, tcx: TyCtxt<'tcx>) -> DefId {
         match *self {
-            ClosureKind::Fn => tcx.require_lang_item(FnTraitLangItem),
+            ClosureKind::Fn => tcx.require_lang_item(FnTraitLangItem, None),
             ClosureKind::FnMut => {
-                tcx.require_lang_item(FnMutTraitLangItem)
+                tcx.require_lang_item(FnMutTraitLangItem, None)
             }
             ClosureKind::FnOnce => {
-                tcx.require_lang_item(FnOnceTraitLangItem)
+                tcx.require_lang_item(FnOnceTraitLangItem, None)
             }
         }
     }

src/librustc/ty/util.rs

@@ -998,7 +998,7 @@ impl<'tcx> ty::TyS<'tcx> {
 
 fn is_copy_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
     let (param_env, ty) = query.into_parts();
-    let trait_def_id = tcx.require_lang_item(lang_items::CopyTraitLangItem);
+    let trait_def_id = tcx.require_lang_item(lang_items::CopyTraitLangItem, None);
     tcx.infer_ctxt()
         .enter(|infcx| traits::type_known_to_meet_bound_modulo_regions(
             &infcx,
@@ -1011,7 +1011,7 @@ fn is_copy_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>)
 
 fn is_sized_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
     let (param_env, ty) = query.into_parts();
-    let trait_def_id = tcx.require_lang_item(lang_items::SizedTraitLangItem);
+    let trait_def_id = tcx.require_lang_item(lang_items::SizedTraitLangItem, None);
     tcx.infer_ctxt()
         .enter(|infcx| traits::type_known_to_meet_bound_modulo_regions(
             &infcx,
@@ -1024,7 +1024,7 @@ fn is_sized_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>)
 
 fn is_freeze_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
     let (param_env, ty) = query.into_parts();
-    let trait_def_id = tcx.require_lang_item(lang_items::FreezeTraitLangItem);
+    let trait_def_id = tcx.require_lang_item(lang_items::FreezeTraitLangItem, None);
     tcx.infer_ctxt()
         .enter(|infcx| traits::type_known_to_meet_bound_modulo_regions(
             &infcx,

src/librustc/ty/wf.rs

@@ -221,7 +221,7 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
         if !subty.has_escaping_bound_vars() {
             let cause = self.cause(cause);
             let trait_ref = ty::TraitRef {
-                def_id: self.infcx.tcx.require_lang_item(lang_items::SizedTraitLangItem),
+                def_id: self.infcx.tcx.require_lang_item(lang_items::SizedTraitLangItem, None),
                 substs: self.infcx.tcx.mk_substs_trait(subty, &[]),
             };
             self.out.push(traits::Obligation::new(cause, self.param_env, trait_ref.to_predicate()));

src/librustc_codegen_ssa/base.rs

@@ -456,7 +456,7 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(cx: &'
         let arg_argv = param_argv;
 
         let (start_fn, args) = if use_start_lang_item {
-            let start_def_id = cx.tcx().require_lang_item(StartFnLangItem);
+            let start_def_id = cx.tcx().require_lang_item(StartFnLangItem, None);
             let start_fn = callee::resolve_and_get_fn(
                 cx,
                 start_def_id,

src/librustc_mir/build/matches/test.rs

@@ -443,7 +443,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             _ => bug!("non_scalar_compare called on non-reference type: {}", ty),
         };
 
-        let eq_def_id = self.hir.tcx().require_lang_item(EqTraitLangItem);
+        let eq_def_id = self.hir.tcx().require_lang_item(EqTraitLangItem, None);
         let method = self.hir.trait_method(eq_def_id, sym::eq, deref_ty, &[deref_ty.into()]);
 
         let bool_ty = self.hir.bool_ty();

src/librustc_mir/transform/qualify_consts.rs

@@ -1752,7 +1752,10 @@ impl<'tcx> MirPass<'tcx> for QualifyAndPromoteConstants<'tcx> {
                 fulfillment_cx.register_bound(&infcx,
                                               param_env,
                                               ty,
-                                              tcx.require_lang_item(lang_items::SyncTraitLangItem),
+                                              tcx.require_lang_item(
+                                                  lang_items::SyncTraitLangItem,
+                                                  None
+                                              ),
                                               cause);
                 if let Err(err) = fulfillment_cx.select_all_or_error(&infcx) {
                     infcx.report_fulfillment_errors(&err, None, false);

src/librustc_mir/util/elaborate_drops.rs

@@ -897,7 +897,7 @@ where
     ) -> BasicBlock {
         let tcx = self.tcx();
         let unit_temp = Place::from(self.new_temp(tcx.mk_unit()));
-        let free_func = tcx.require_lang_item(lang_items::BoxFreeFnLangItem);
+        let free_func = tcx.require_lang_item(lang_items::BoxFreeFnLangItem, None);
         let args = adt.variants[VariantIdx::new(0)].fields.iter().enumerate().map(|(i, f)| {
             let field = Field::new(i);
             let field_ty = f.ty(self.tcx(), substs);

src/librustc_typeck/check/cast.rs

@@ -649,7 +649,7 @@ impl<'a, 'tcx> CastCheck<'tcx> {
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     fn type_is_known_to_be_sized_modulo_regions(&self, ty: Ty<'tcx>, span: Span) -> bool {
-        let lang_item = self.tcx.require_lang_item(lang_items::SizedTraitLangItem);
+        let lang_item = self.tcx.require_lang_item(lang_items::SizedTraitLangItem, None);
         traits::type_known_to_meet_bound_modulo_regions(self, self.param_env, ty, lang_item, span)
     }
 }

src/librustc_typeck/check/closure.rs

@@ -266,7 +266,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let trait_ref = projection.to_poly_trait_ref(tcx);
 
         let is_fn = tcx.lang_items().fn_trait_kind(trait_ref.def_id()).is_some();
-        let gen_trait = tcx.require_lang_item(lang_items::GeneratorTraitLangItem);
+        let gen_trait = tcx.require_lang_item(lang_items::GeneratorTraitLangItem, cause_span);
         let is_gen = gen_trait == trait_ref.def_id();
         if !is_fn && !is_gen {
             debug!("deduce_sig_from_projection: not fn or generator");

src/librustc_typeck/check/mod.rs

@@ -2622,7 +2622,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                  span: Span,
                                  code: traits::ObligationCauseCode<'tcx>)
     {
-        let lang_item = self.tcx.require_lang_item(lang_items::SizedTraitLangItem);
+        let lang_item = self.tcx.require_lang_item(lang_items::SizedTraitLangItem, None);
         self.require_type_meets(ty, span, code, lang_item);
     }
 

src/librustc_typeck/check/wfcheck.rs

@@ -287,7 +287,7 @@ fn check_type_defn<'tcx, F>(
                 let last = idx == variant.fields.len() - 1;
                 fcx.register_bound(
                     field.ty,
-                    fcx.tcx.require_lang_item(lang_items::SizedTraitLangItem),
+                    fcx.tcx.require_lang_item(lang_items::SizedTraitLangItem, None),
                     traits::ObligationCause::new(
                         field.span,
                         fcx.body_id,
@@ -375,7 +375,7 @@ fn check_item_type(
         if forbid_unsized {
             fcx.register_bound(
                 item_ty,
-                fcx.tcx.require_lang_item(lang_items::SizedTraitLangItem),
+                fcx.tcx.require_lang_item(lang_items::SizedTraitLangItem, None),
                 traits::ObligationCause::new(ty_span, fcx.body_id, traits::MiscObligation),
             );
         }

src/librustdoc/clean/auto_trait.rs

@@ -464,7 +464,7 @@ impl<'a, 'tcx> AutoTraitFinder<'a, 'tcx> {
         // it is *not* required (i.e., '?Sized')
         let sized_trait = self.cx
             .tcx
-            .require_lang_item(lang_items::SizedTraitLangItem);
+            .require_lang_item(lang_items::SizedTraitLangItem, None);
 
         let mut replacer = RegionReplacer {
             vid_to_region: &vid_to_region,
@@ -777,9 +777,9 @@ impl<'a, 'tcx> AutoTraitFinder<'a, 'tcx> {
     fn is_fn_ty(&self, tcx: TyCtxt<'_>, ty: &Type) -> bool {
         match &ty {
             &&Type::ResolvedPath { ref did, .. } => {
-                *did == tcx.require_lang_item(lang_items::FnTraitLangItem)
+                *did == tcx.require_lang_item(lang_items::FnTraitLangItem, None)
-                    || *did == tcx.require_lang_item(lang_items::FnMutTraitLangItem)
+                    || *did == tcx.require_lang_item(lang_items::FnMutTraitLangItem, None)
-                    || *did == tcx.require_lang_item(lang_items::FnOnceTraitLangItem)
+                    || *did == tcx.require_lang_item(lang_items::FnOnceTraitLangItem, None)
             }
             _ => false,
         }

src/librustdoc/clean/mod.rs

@@ -1060,7 +1060,7 @@ pub enum GenericBound {
 
 impl GenericBound {
     fn maybe_sized(cx: &DocContext<'_>) -> GenericBound {
-        let did = cx.tcx.require_lang_item(lang_items::SizedTraitLangItem);
+        let did = cx.tcx.require_lang_item(lang_items::SizedTraitLangItem, None);
         let empty = cx.tcx.intern_substs(&[]);
         let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
             Some(did), false, vec![], empty);

src/test/ui/lang-item-missing-generator.stderr

@@ -1,4 +1,8 @@
 error: requires `generator` lang_item
+  --> $DIR/lang-item-missing-generator.rs:15:17
+   |
+LL | pub fn abc() -> impl FnOnce(f32) {
+   |                 ^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error