diff --git a/src/librustc/middle/expr_use_visitor.rs b/src/librustc/middle/expr_use_visitor.rs
index a44679b0b3e0e..dc40d0bc649d7 100644
--- a/src/librustc/middle/expr_use_visitor.rs
+++ b/src/librustc/middle/expr_use_visitor.rs
@@ -288,6 +288,8 @@ impl<'a, 'gcx, 'tcx> ExprUseVisitor<'a, 'gcx, 'tcx> {
     }
 
     pub fn consume_body(&mut self, body: &hir::Body) {
+        debug!("consume_body(body={:?})", body);
+
         for arg in &body.arguments {
             let arg_ty = return_if_err!(self.mc.infcx.node_ty(arg.pat.id));