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src/librustc_mir/transform/qualify_consts.rs

@@ -1754,7 +1754,7 @@ impl<'tcx> MirPass<'tcx> for QualifyAndPromoteConstants<'tcx> {
                                               ty,
                                               tcx.require_lang_item(
                                                   lang_items::SyncTraitLangItem,
-                                                  None
+                                                  Some(body.span)
                                               ),
                                               cause);
                 if let Err(err) = fulfillment_cx.select_all_or_error(&infcx) {

src/librustc_mir/util/elaborate_drops.rs

@@ -897,7 +897,10 @@ 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, None);
+        let free_func = tcx.require_lang_item(
+            lang_items::BoxFreeFnLangItem,
+            Some(self.source_info.span)
+        );
         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, None);
+        let lang_item = self.tcx.require_lang_item(lang_items::SizedTraitLangItem, Some(span));
         traits::type_known_to_meet_bound_modulo_regions(self, self.param_env, ty, lang_item, span)
     }
 }

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, None);
+        let lang_item = self.tcx.require_lang_item(lang_items::SizedTraitLangItem, Some(span));
         self.require_type_meets(ty, span, code, lang_item);
     }
 

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

@@ -1,4 +1,8 @@
 error: requires `sized` lang_item
+  --> $DIR/lang-item-missing.rs:10:50
+   |
+LL | fn start(argc: isize, argv: *const *const u8) -> isize {
+   |                                                  ^^^^^
 
 error: aborting due to previous error
 

src/test/ui/privacy/privacy2.rs

@@ -11,7 +11,7 @@ mod bar {
     }
 }
 
-pub fn foo() {}
+pub fn foo() {} //~ ERROR: requires `sized` lang_item
 
 fn test1() {
     use bar::foo;

src/test/ui/privacy/privacy2.stderr

@@ -11,6 +11,10 @@ LL |     use bar::glob::foo;
    |                    ^^^
 
 error: requires `sized` lang_item
+  --> $DIR/privacy2.rs:14:14
+   |
+LL | pub fn foo() {}
+   |              ^
 
 error: aborting due to 3 previous errors
 

src/test/ui/privacy/privacy3.rs

@@ -8,7 +8,7 @@ mod bar {
     pub use self::glob::*;
 
     mod glob {
-        fn gpriv() {}
+        fn gpriv() {} //~ ERROR: requires `sized` lang_item
     }
 }
 

src/test/ui/privacy/privacy3.stderr

@@ -5,6 +5,10 @@ LL |     use bar::gpriv;
    |         ^^^^^^^^^^ no `gpriv` in `bar`
 
 error: requires `sized` lang_item
+  --> $DIR/privacy3.rs:11:20
+   |
+LL |         fn gpriv() {}
+   |                    ^
 
 error: aborting due to 2 previous errors