diff --git a/src/librustc_typeck/check/op.rs b/src/librustc_typeck/check/op.rs
index 78ce0bf9cc16b..d1ca05780930a 100644
--- a/src/librustc_typeck/check/op.rs
+++ b/src/librustc_typeck/check/op.rs
@@ -443,13 +443,16 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     ) -> bool /* did we suggest to call a function because of missing parenthesis? */ {
         err.span_label(span, ty.to_string());
         if let FnDef(def_id, _) = ty.sty {
+            let source_map = self.tcx.sess.source_map();
+            let hir_id = match self.tcx.hir().as_local_hir_id(def_id) {
+                Some(hir_id) => hir_id,
+                None => return false,
+            };
             if self.tcx.has_typeck_tables(def_id) == false {
                 return false;
             }
-            let source_map = self.tcx.sess.source_map();
-            let hir_id = &self.tcx.hir().as_local_hir_id(def_id).unwrap();
             let fn_sig = {
-                match self.tcx.typeck_tables_of(def_id).liberated_fn_sigs().get(*hir_id) {
+                match self.tcx.typeck_tables_of(def_id).liberated_fn_sigs().get(hir_id) {
                     Some(f) => f.clone(),
                     None => {
                         bug!("No fn-sig entry for def_id={:?}", def_id);
@@ -458,11 +461,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
             };
 
             let other_ty = if let FnDef(def_id, _) = other_ty.sty {
+                let hir_id = match self.tcx.hir().as_local_hir_id(def_id) {
+                    Some(hir_id) => hir_id,
+                    None => return false,
+                };
                 if self.tcx.has_typeck_tables(def_id) == false {
                     return false;
                 }
-                let hir_id = &self.tcx.hir().as_local_hir_id(def_id).unwrap();
-                match self.tcx.typeck_tables_of(def_id).liberated_fn_sigs().get(*hir_id) {
+                match self.tcx.typeck_tables_of(def_id).liberated_fn_sigs().get(hir_id) {
                     Some(f) => f.clone().output(),
                     None => {
                         bug!("No fn-sig entry for def_id={:?}", def_id);