From 9eb595705e754c970de76375060455bc3f576296 Mon Sep 17 00:00:00 2001
From: Avi Dessauer <avi.the.coder@gmail.com>
Date: Wed, 8 Jul 2020 15:32:11 -0400
Subject: [PATCH] Update src/librustc_typeck/astconv.rs

Co-authored-by: varkor <github@varkor.com>
---
 compiler/rustc_typeck/src/astconv/mod.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_typeck/src/astconv/mod.rs b/compiler/rustc_typeck/src/astconv/mod.rs
index 3c95184c35f..46b8b2e14c7 100644
--- a/compiler/rustc_typeck/src/astconv/mod.rs
+++ b/compiler/rustc_typeck/src/astconv/mod.rs
@@ -366,7 +366,13 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                             param.def_id,
                             Some(arg.id()),
                             arg.span(),
-                            |_, _| (),
+                            |_, _| {
+                                // Default generic parameters may not be marked
+                                // with stability attributes, i.e. when the
+                                // default parameter was defined at the same time
+                                // as the rest of the type. As such, we ignore missing
+                                // stability attributes.
+                            },
                         )
                     }
                     if let (hir::TyKind::Infer, false) = (&ty.kind, self.allow_ty_infer()) {