remove rustc_typeck::same_type_err

src/librustc/infer/error_reporting.rs

@@ -554,6 +554,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                                          trace: TypeTrace<'tcx>,
                                          terr: &TypeError<'tcx>)
                                          -> DiagnosticBuilder<'tcx> {
+        let trace = self.resolve_type_vars_if_possible(&trace);
         let span = trace.origin.span();
         let mut err = self.report_type_error(trace, terr);
         self.tcx.note_and_explain_type_err(&mut err, terr, span);
@@ -1643,6 +1644,15 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
                     TypeOrigin::EquatePredicate(_) => {
                         "equality where clause is satisfied"
                     }
+                    TypeOrigin::MainFunctionType(_) => {
+                        "the `main` function has the correct type"
+                    }
+                    TypeOrigin::StartFunctionType(_) => {
+                        "the `start` function has the correct type"
+                    }
+                    TypeOrigin::IntrinsicType(_) => {
+                        "the intrinsic has the correct type"
+                    }
                 };
 
                 match self.values_str(&trace.values) {

src/librustc/infer/mod.rs

@@ -32,7 +32,7 @@ use ty::adjustment;
 use ty::{TyVid, IntVid, FloatVid};
 use ty::{self, Ty, TyCtxt};
 use ty::error::{ExpectedFound, TypeError, UnconstrainedNumeric};
-use ty::fold::TypeFoldable;
+use ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
 use ty::relate::{Relate, RelateResult, TypeRelation};
 use traits::{self, PredicateObligations, ProjectionMode};
 use rustc_data_structures::unify::{self, UnificationTable};
@@ -219,6 +219,15 @@ pub enum TypeOrigin {
 
     // `where a == b`
     EquatePredicate(Span),
+
+    // `main` has wrong type
+    MainFunctionType(Span),
+
+    // `start` has wrong type
+    StartFunctionType(Span),
+
+    // intrinsic has wrong type
+    IntrinsicType(Span),
 }
 
 impl TypeOrigin {
@@ -238,6 +247,9 @@ impl TypeOrigin {
             &TypeOrigin::IfExpressionWithNoElse(_) => "if may be missing an else clause",
             &TypeOrigin::RangeExpression(_) => "start and end of range have incompatible types",
             &TypeOrigin::EquatePredicate(_) => "equality predicate not satisfied",
+            &TypeOrigin::MainFunctionType(_) => "main function has wrong type",
+            &TypeOrigin::StartFunctionType(_) => "start function has wrong type",
+            &TypeOrigin::IntrinsicType(_) => "intrinsic has wrong type",
         }
     }
 }
@@ -1791,6 +1803,9 @@ impl TypeOrigin {
             TypeOrigin::IfExpressionWithNoElse(span) => span,
             TypeOrigin::RangeExpression(span) => span,
             TypeOrigin::EquatePredicate(span) => span,
+            TypeOrigin::MainFunctionType(span) => span,
+            TypeOrigin::StartFunctionType(span) => span,
+            TypeOrigin::IntrinsicType(span) => span,
         }
     }
 }
@@ -1841,3 +1856,50 @@ impl RegionVariableOrigin {
         }
     }
 }
+
+impl<'tcx> TypeFoldable<'tcx> for TypeOrigin {
+    fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, _folder: &mut F) -> Self {
+        self.clone()
+    }
+
+    fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> bool {
+        false
+    }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ValuePairs<'tcx> {
+    fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
+        match *self {
+            ValuePairs::Types(ref ef) => {
+                ValuePairs::Types(ef.fold_with(folder))
+            }
+            ValuePairs::TraitRefs(ref ef) => {
+                ValuePairs::TraitRefs(ef.fold_with(folder))
+            }
+            ValuePairs::PolyTraitRefs(ref ef) => {
+                ValuePairs::PolyTraitRefs(ef.fold_with(folder))
+            }
+        }
+    }
+
+    fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
+        match *self {
+            ValuePairs::Types(ref ef) => ef.visit_with(visitor),
+            ValuePairs::TraitRefs(ref ef) => ef.visit_with(visitor),
+            ValuePairs::PolyTraitRefs(ref ef) => ef.visit_with(visitor),
+        }
+    }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for TypeTrace<'tcx> {
+    fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
+        TypeTrace {
+            origin: self.origin.fold_with(folder),
+            values: self.values.fold_with(folder)
+        }
+    }
+
+    fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
+        self.origin.visit_with(visitor) || self.values.visit_with(visitor)
+    }
+}

src/librustc/ty/structural_impls.rs

@@ -1018,3 +1018,16 @@ impl<'tcx> TypeFoldable<'tcx> for ty::TypeScheme<'tcx>  {
         self.generics.visit_with(visitor) || self.ty.visit_with(visitor)
     }
 }
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::error::ExpectedFound<T> {
+    fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
+        ty::error::ExpectedFound {
+            expected: self.expected.fold_with(folder),
+            found: self.found.fold_with(folder),
+        }
+    }
+
+    fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
+        self.expected.visit_with(visitor) || self.found.visit_with(visitor)
+    }
+}