rustc_mir: add sanity asserts for the types of ty::Consts.

Author: eddyb

src/librustc_mir/build/expr/as_constant.rs

@@ -38,6 +38,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                         inferred_ty: ty,
                     })
                 });
+                assert_eq!(literal.ty, ty);
                 Constant {
                     span,
                     user_ty,

src/librustc_mir/build/matches/test.rs

@@ -63,6 +63,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             }
 
             PatternKind::Range(range) => {
+                assert_eq!(range.lo.ty, match_pair.pattern.ty);
+                assert_eq!(range.hi.ty, match_pair.pattern.ty);
                 Test {
                     span: match_pair.pattern.span,
                     kind: TestKind::Range(range),
@@ -269,6 +271,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     );
                 } else {
                     if let [success, fail] = *make_target_blocks(self) {
+                        assert_eq!(value.ty, ty);
                         let expect = self.literal_operand(test.span, value);
                         let val = Operand::Copy(place.clone());
                         self.compare(block, success, fail, source_info, BinOp::Eq, expect, val);

src/librustc_mir/hair/pattern/mod.rs

@@ -441,6 +441,8 @@ impl<'a, 'tcx> PatternContext<'a, 'tcx> {
 
                 let mut kind = match (lo, hi) {
                     (PatternKind::Constant { value: lo }, PatternKind::Constant { value: hi }) => {
+                        assert_eq!(lo.ty, ty);
+                        assert_eq!(hi.ty, ty);
                         let cmp = compare_const_vals(
                             self.tcx,
                             lo,