fix ICE from debug output by using kind_ty in dumping closure

Also, make `-Zverbose` dump all info about constants.

src/librustc/ty/print/pretty.rs

@@ -689,7 +689,7 @@ pub trait PrettyPrinter<'tcx>:
                 if self.tcx().sess.verbose() {
                     p!(write(
                         " closure_kind_ty={:?} closure_sig_ty={:?}",
-                        substs.as_closure().kind(did, self.tcx()),
+                        substs.as_closure().kind_ty(did, self.tcx()),
                         substs.as_closure().sig_ty(did, self.tcx())
                     ));
                 }
@@ -698,7 +698,9 @@ pub trait PrettyPrinter<'tcx>:
             },
             ty::Array(ty, sz) => {
                 p!(write("["), print(ty), write("; "));
-                if let ConstValue::Unevaluated(..) = sz.val {
+                if self.tcx().sess.verbose() {
+                    p!(write("{:?}", sz));
+                } else if let ConstValue::Unevaluated(..) = sz.val {
                     // do not try to evalute unevaluated constants. If we are const evaluating an
                     // array length anon const, rustc will (with debug assertions) print the
                     // constant's path. Which will end up here again.
@@ -855,6 +857,11 @@ pub trait PrettyPrinter<'tcx>:
     ) -> Result<Self::Const, Self::Error> {
         define_scoped_cx!(self);
 
+        if self.tcx().sess.verbose() {
+            p!(write("Const({:?}: {:?})", ct.val, ct.ty));
+            return Ok(self);
+        }
+
         let u8 = self.tcx().types.u8;
         if let ty::FnDef(did, substs) = ct.ty.kind {
             p!(print_value_path(did, substs));