1 files changed, 12 insertions, 39 deletions

diff --git a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
index 6223c5ea3..7d299e30a 100644
--- a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
@@ -12,11 +12,10 @@
 pub mod specialization_graph;
 use specialization_graph::GraphExt;
 
+use crate::errors::NegativePositiveConflict;
 use crate::infer::{InferCtxt, InferOk, TyCtxtInferExt};
 use crate::traits::select::IntercrateAmbiguityCause;
-use crate::traits::{
-    self, coherence, FutureCompatOverlapErrorKind, ObligationCause, TraitEngine, TraitEngineExt,
-};
+use crate::traits::{self, coherence, FutureCompatOverlapErrorKind, ObligationCause};
 use rustc_data_structures::fx::{FxHashSet, FxIndexSet};
 use rustc_errors::{struct_span_err, EmissionGuarantee, LintDiagnosticBuilder};
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -26,8 +25,8 @@ use rustc_session::lint::builtin::COHERENCE_LEAK_CHECK;
 use rustc_session::lint::builtin::ORDER_DEPENDENT_TRAIT_OBJECTS;
 use rustc_span::{Span, DUMMY_SP};
 
+use super::util;
 use super::SelectionContext;
-use super::{util, FulfillmentContext};
 
 /// Information pertinent to an overlapping impl error.
 #[derive(Debug)]
@@ -153,7 +152,6 @@ pub(super) fn specializes(tcx: TyCtxt<'_>, (impl1_def_id, impl2_def_id): (DefId,
     tcx.infer_ctxt().enter(|infcx| {
         let impl1_trait_ref = match traits::fully_normalize(
             &infcx,
-            FulfillmentContext::new(),
             ObligationCause::dummy(),
             penv,
             impl1_trait_ref,
@@ -211,11 +209,8 @@ fn fulfill_implication<'a, 'tcx>(
     // (which are packed up in penv)
 
     infcx.save_and_restore_in_snapshot_flag(|infcx| {
-        let mut fulfill_cx = <dyn TraitEngine<'tcx>>::new(infcx.tcx);
-        for oblig in obligations.chain(more_obligations) {
-            fulfill_cx.register_predicate_obligation(&infcx, oblig);
-        }
-        match fulfill_cx.select_all_or_error(infcx).as_slice() {
+        let errors = traits::fully_solve_obligations(&infcx, obligations.chain(more_obligations));
+        match &errors[..] {
             [] => {
                 debug!(
                     "fulfill_implication: an impl for {:?} specializes {:?}",
@@ -333,35 +328,13 @@ fn report_negative_positive_conflict(
     positive_impl_def_id: DefId,
     sg: &mut specialization_graph::Graph,
 ) {
-    let impl_span = tcx.def_span(local_impl_def_id);
-
-    let mut err = struct_span_err!(
-        tcx.sess,
-        impl_span,
-        E0751,
-        "found both positive and negative implementation of trait `{}`{}:",
-        overlap.trait_desc,
-        overlap.self_desc.clone().map_or_else(String::new, |ty| format!(" for type `{}`", ty))
-    );
-
-    match tcx.span_of_impl(negative_impl_def_id) {
-        Ok(span) => {
-            err.span_label(span, "negative implementation here");
-        }
-        Err(cname) => {
-            err.note(&format!("negative implementation in crate `{}`", cname));
-        }
-    }
-
-    match tcx.span_of_impl(positive_impl_def_id) {
-        Ok(span) => {
-            err.span_label(span, "positive implementation here");
-        }
-        Err(cname) => {
-            err.note(&format!("positive implementation in crate `{}`", cname));
-        }
-    }
-
+    let mut err = tcx.sess.create_err(NegativePositiveConflict {
+        impl_span: tcx.def_span(local_impl_def_id),
+        trait_desc: &overlap.trait_desc,
+        self_desc: &overlap.self_desc,
+        negative_impl_span: tcx.span_of_impl(negative_impl_def_id),
+        positive_impl_span: tcx.span_of_impl(positive_impl_def_id),
+    });
     sg.has_errored = Some(err.emit());
 }