Properly handle expression blocks in kind.rs

It was only noticing them in expr_block form, not as function
bodies.

Closes #1390

Author: marijnh

src/comp/middle/kind.rs

@@ -44,6 +44,7 @@ fn check_crate(tcx: ty::ctxt, method_map: typeck::method_map,
     let visit = visit::mk_vt(@{
         visit_expr: check_expr,
         visit_stmt: check_stmt,
+        visit_block: check_block,
         visit_fn: check_fn
         with *visit::default_visitor()
     });
@@ -117,12 +118,18 @@ fn check_fn_cap_clause(cx: ctx,
     }
 }
 
-fn check_expr(e: @expr, cx: ctx, v: visit::vt<ctx>) {
+fn check_block(b: blk, cx: ctx, v: visit::vt<ctx>) {
+    alt b.node.expr {
+      some(ex) { maybe_copy(cx, ex); }
+      _ {}
+    }
+    visit::visit_block(b, cx, v);
+}
 
+fn check_expr(e: @expr, cx: ctx, v: visit::vt<ctx>) {
     alt e.node {
       expr_assign(_, ex) | expr_assign_op(_, _, ex) |
-      expr_block({node: {expr: some(ex), _}, _}) |
-      expr_unary(box(_), ex) | expr_unary(uniq(_), ex) { maybe_copy(cx, ex); }
+      expr_unary(box(_), ex) | expr_unary(uniq(_), ex) |
       expr_ret(some(ex)) { maybe_copy(cx, ex); }
       expr_copy(expr) { check_copy_ex(cx, expr, false); }
       // Vector add copies.