infer: Take the origin in report_mismatched_types.

src/librustc/middle/infer/mod.rs

@@ -1351,18 +1351,18 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     }
 
     pub fn report_mismatched_types(&self,
-                                   span: Span,
+                                   origin: TypeOrigin,
                                    expected: Ty<'tcx>,
                                    actual: Ty<'tcx>,
-                                   err: &TypeError<'tcx>) {
+                                   err: TypeError<'tcx>) {
         let trace = TypeTrace {
-            origin: TypeOrigin::Misc(span),
+            origin: origin,
             values: Types(ExpectedFound {
                 expected: expected,
                 found: actual
             })
         };
-        self.report_and_explain_type_error(trace, err);
+        self.report_and_explain_type_error(trace, &err);
     }
 
     pub fn report_conflicting_default_types(&self,

src/librustc_typeck/check/demand.rs

@@ -10,45 +10,27 @@
 
 
 use check::{coercion, FnCtxt};
-use middle::ty::{self, Ty};
-use middle::infer::{self, TypeOrigin};
+use middle::ty::Ty;
+use middle::infer::TypeOrigin;
 
-use std::result::Result::{Err, Ok};
 use syntax::codemap::Span;
 use rustc_front::hir;
 
 // Requires that the two types unify, and prints an error message if
 // they don't.
 pub fn suptype<'a, 'tcx>(fcx: &FnCtxt<'a, 'tcx>, sp: Span,
-                         ty_expected: Ty<'tcx>, ty_actual: Ty<'tcx>) {
-    suptype_with_fn(fcx, sp, false, ty_expected, ty_actual,
-        |sp, e, a, s| { fcx.report_mismatched_types(sp, e, a, s) })
-}
-
-/// As `suptype`, but call `handle_err` if unification for subtyping fails.
-pub fn suptype_with_fn<'a, 'tcx, F>(fcx: &FnCtxt<'a, 'tcx>,
-                                    sp: Span,
-                                    b_is_expected: bool,
-                                    ty_a: Ty<'tcx>,
-                                    ty_b: Ty<'tcx>,
-                                    handle_err: F) where
-    F: FnOnce(Span, Ty<'tcx>, Ty<'tcx>, &ty::error::TypeError<'tcx>),
-{
-    // n.b.: order of actual, expected is reversed
-    match infer::mk_subty(fcx.infcx(), b_is_expected, TypeOrigin::Misc(sp),
-                          ty_b, ty_a) {
-      Ok(()) => { /* ok */ }
-      Err(ref err) => {
-          handle_err(sp, ty_a, ty_b, err);
-      }
+                         expected: Ty<'tcx>, actual: Ty<'tcx>) {
+    let origin = TypeOrigin::Misc(sp);
+    if let Err(e) = fcx.infcx().sub_types(false, origin, actual, expected) {
+        fcx.infcx().report_mismatched_types(origin, expected, actual, e);
     }
 }
 
 pub fn eqtype<'a, 'tcx>(fcx: &FnCtxt<'a, 'tcx>, sp: Span,
                         expected: Ty<'tcx>, actual: Ty<'tcx>) {
-    match infer::mk_eqty(fcx.infcx(), false, TypeOrigin::Misc(sp), actual, expected) {
-        Ok(()) => { /* ok */ }
-        Err(ref err) => { fcx.report_mismatched_types(sp, expected, actual, err); }
+    let origin = TypeOrigin::Misc(sp);
+    if let Err(e) = fcx.infcx().eq_types(false, origin, actual, expected) {
+        fcx.infcx().report_mismatched_types(origin, expected, actual, e);
     }
 }
 
@@ -63,10 +45,8 @@ pub fn coerce<'a, 'tcx>(fcx: &FnCtxt<'a, 'tcx>,
            expr_ty);
     let expr_ty = fcx.resolve_type_vars_if_possible(expr_ty);
     let expected = fcx.resolve_type_vars_if_possible(expected);
-    match coercion::mk_assignty(fcx, expr, expr_ty, expected) {
-      Ok(()) => { /* ok */ }
-      Err(ref err) => {
-        fcx.report_mismatched_types(sp, expected, expr_ty, err);
-      }
+    let origin = TypeOrigin::Misc(sp);
+    if let Err(e) = coercion::try(fcx, expr, expr_ty, expected) {
+        fcx.infcx().report_mismatched_types(origin, expected, expr_ty, e);
     }
 }

src/librustc_typeck/check/mod.rs

@@ -1622,14 +1622,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.infcx().type_error_struct(sp, mk_msg, actual_ty, err)
     }
 
-    pub fn report_mismatched_types(&self,
-                                   sp: Span,
-                                   e: Ty<'tcx>,
-                                   a: Ty<'tcx>,
-                                   err: &TypeError<'tcx>) {
-        self.infcx().report_mismatched_types(sp, e, a, err)
-    }
-
     /// Registers an obligation for checking later, during regionck, that the type `ty` must
     /// outlive the region `r`.
     pub fn register_region_obligation(&self,

src/librustc_typeck/coherence/mod.rs

@@ -385,11 +385,12 @@ impl<'a, 'tcx> CoherenceChecker<'a, 'tcx> {
 
             let infcx = new_infer_ctxt(tcx, &tcx.tables, Some(param_env));
 
+            let origin = TypeOrigin::Misc(span);
             let check_mutbl = |mt_a: ty::TypeAndMut<'tcx>, mt_b: ty::TypeAndMut<'tcx>,
                                mk_ptr: &Fn(Ty<'tcx>) -> Ty<'tcx>| {
                 if (mt_a.mutbl, mt_b.mutbl) == (hir::MutImmutable, hir::MutMutable) {
-                    infcx.report_mismatched_types(span, mk_ptr(mt_b.ty),
-                                                  target, &ty::error::TypeError::Mutability);
+                    infcx.report_mismatched_types(origin, mk_ptr(mt_b.ty),
+                                                  target, ty::error::TypeError::Mutability);
                 }
                 (mt_a.ty, mt_b.ty, unsize_trait, None)
             };
@@ -418,7 +419,6 @@ impl<'a, 'tcx> CoherenceChecker<'a, 'tcx> {
                         return;
                     }
 
-                    let origin = TypeOrigin::Misc(span);
                     let fields = &def_a.struct_variant().fields;
                     let diff_fields = fields.iter().enumerate().filter_map(|(i, f)| {
                         let (a, b) = (f.ty(tcx, substs_a), f.ty(tcx, substs_b));