X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibrustc%2Ftraits%2Ferror_reporting.rs;h=367a7eacdfcaf50dd4e61a592f163f65a79e82ad;hb=0d883cb8f82ec5d99f63d03bd43c6fc87d96aeef;hp=0e63ef666c75a02b2a9449a259982eaa8cba2ae9;hpb=e8ca35e63dda82a8b5fa8eb72cf3e490a5794a46;p=rust.git

diff --git a/src/librustc/traits/error_reporting.rs b/src/librustc/traits/error_reporting.rs
index 0e63ef666c7..367a7eacdfc 100644
--- a/src/librustc/traits/error_reporting.rs
+++ b/src/librustc/traits/error_reporting.rs
@@ -418,9 +418,7 @@ fn on_unimplemented_note(
                     Some(format!("[{}]", self.tcx.type_of(def.did).to_string())),
                 ));
                 let tcx = self.tcx;
-                if let Some(len) = len.val.try_to_scalar().and_then(|scalar| {
-                    scalar.to_usize(&tcx).ok()
-                }) {
+                if let Some(len) = len.assert_usize(tcx) {
                     flags.push((
                         "_Self".to_owned(),
                         Some(format!("[{}; {}]", self.tcx.type_of(def.did).to_string(), len)),
@@ -449,7 +447,7 @@ fn find_similar_impl_candidates(&self,
     {
         let simp = fast_reject::simplify_type(self.tcx,
                                               trait_ref.skip_binder().self_ty(),
-                                              true,);
+                                              true);
         let all_impls = self.tcx.all_impls(trait_ref.def_id());
 
         match simp {
@@ -728,12 +726,9 @@ pub fn report_selection_error(&self,
                     }
 
                     ty::Predicate::RegionOutlives(ref predicate) => {
-                        let predicate = self.resolve_type_vars_if_possible(predicate);
-                        let err = self.region_outlives_predicate(&obligation.cause,
-                                                                 &predicate).err().unwrap();
-                        struct_span_err!(self.tcx.sess, span, E0279,
-                            "the requirement `{}` is not satisfied (`{}`)",
-                            predicate, err)
+                        // These errors should show up as region
+                        // inference failures.
+                        panic!("region outlives {:?} failed", predicate);
                     }
 
                     ty::Predicate::Projection(..) | ty::Predicate::TypeOutlives(..) => {
@@ -1449,15 +1444,15 @@ fn note_obligation_cause_code<T>(&self,
         match *cause_code {
             ObligationCauseCode::ExprAssignable |
             ObligationCauseCode::MatchExpressionArm { .. } |
-            ObligationCauseCode::IfExpression |
+            ObligationCauseCode::MatchExpressionArmPattern { .. } |
+            ObligationCauseCode::IfExpression { .. } |
             ObligationCauseCode::IfExpressionWithNoElse |
             ObligationCauseCode::MainFunctionType |
             ObligationCauseCode::StartFunctionType |
             ObligationCauseCode::IntrinsicType |
             ObligationCauseCode::MethodReceiver |
             ObligationCauseCode::ReturnNoExpression |
-            ObligationCauseCode::MiscObligation => {
-            }
+            ObligationCauseCode::MiscObligation => {}
             ObligationCauseCode::SliceOrArrayElem => {
                 err.note("slice and array elements must have `Sized` type");
             }