nr2.0: Fix resolution of constant items

gcc/rust/ChangeLog:

	* resolve/rust-default-resolver.cc (DefaultResolver::visit):
	Call DefaultASTVisitor::visit even on ConstantItem instances
	without expressions.

gcc/testsuite/ChangeLog:

	* rust/compile/nr2/exclude: Remove issue-3642.rs.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

Author: powerboat9

gcc/rust/resolve/rust-default-resolver.cc

@@ -361,19 +361,15 @@ DefaultResolver::visit (AST::MatchExpr &expr)
 void
 DefaultResolver::visit (AST::ConstantItem &item)
 {
-  if (item.has_expr ())
-    {
-      auto expr_vis_1
-	= [this, &item] () { AST::DefaultASTVisitor::visit (item); };
-
-      auto expr_vis_2 = [this, &item, &expr_vis_1] () {
-	ctx.canonical_ctx.scope (item.get_node_id (), item.get_identifier (),
-				 std::move (expr_vis_1));
-      };
-
-      // FIXME: Why do we need a Rib here?
-      ctx.scoped (Rib::Kind::ConstantItem, item.get_node_id (), expr_vis_2);
-    }
+  auto expr_vis_1 = [this, &item] () { AST::DefaultASTVisitor::visit (item); };
+
+  auto expr_vis_2 = [this, &item, &expr_vis_1] () {
+    ctx.canonical_ctx.scope (item.get_node_id (), item.get_identifier (),
+			     std::move (expr_vis_1));
+  };
+
+  // FIXME: Why do we need a Rib here?
+  ctx.scoped (Rib::Kind::ConstantItem, item.get_node_id (), expr_vis_2);
 }
 
 void

gcc/testsuite/rust/compile/nr2/exclude

@@ -1,4 +1,3 @@
 issue-3315-2.rs
 torture/alt_patterns1.rs
-issue-3642.rs
 # please don't delete the trailing newline