diff --git a/src/librustc/hir/mod.rs b/src/librustc/hir/mod.rs
index e6080fad91d5..f471ffb072d6 100644
--- a/src/librustc/hir/mod.rs
+++ b/src/librustc/hir/mod.rs
@@ -2277,6 +2277,7 @@ bitflags! {
         const NAKED                     = 0b0001_0000;
         const NO_MANGLE                 = 0b0010_0000;
         const RUSTC_STD_INTERNAL_SYMBOL = 0b0100_0000;
+        const NO_DEBUG                  = 0b1000_0000;
     }
 }
 
diff --git a/src/librustc_typeck/collect.rs b/src/librustc_typeck/collect.rs
index d9e5ac7f7c57..6bd38244e8ca 100644
--- a/src/librustc_typeck/collect.rs
+++ b/src/librustc_typeck/collect.rs
@@ -1825,6 +1825,8 @@ fn trans_fn_attrs<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, id: DefId) -> TransFnAt
             trans_fn_attrs.flags |= TransFnAttrFlags::NO_MANGLE;
         } else if attr.check_name("rustc_std_internal_symbol") {
             trans_fn_attrs.flags |= TransFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL;
+        } else if attr.check_name("no_debug") {
+            trans_fn_attrs.flags |= TransFnAttrFlags::NO_DEBUG;
         } else if attr.check_name("inline") {
             trans_fn_attrs.inline = attrs.iter().fold(InlineAttr::None, |ia, attr| {
                 if attr.path != "inline" {