diff --git a/src/test/ui/stability-attribute/auxiliary/unstable_generic_param.rs b/src/test/ui/stability-attribute/auxiliary/unstable_generic_param.rs
index 4807c486f13ca..9f4889f59a564 100644
--- a/src/test/ui/stability-attribute/auxiliary/unstable_generic_param.rs
+++ b/src/test/ui/stability-attribute/auxiliary/unstable_generic_param.rs
@@ -14,3 +14,22 @@ pub trait Trait2<T = ()> {
     #[stable(feature = "stable_test_feature", since = "1.0.0")]
     fn foo() -> T;
 }
+
+#[stable(feature = "stable_test_feature", since = "1.0.0")]
+pub struct Struct1<#[unstable(feature = "unstable_default", issue = "none")] T = usize> {
+    #[stable(feature = "stable_test_feature", since = "1.0.0")]
+    pub field: T,
+}
+
+#[stable(feature = "stable_test_feature", since = "1.0.0")]
+pub struct Struct2<T = usize> {
+    #[stable(feature = "stable_test_feature", since = "1.0.0")]
+    pub field: T,
+}
+
+
+#[stable(feature = "stable_test_feature", since = "1.0.0")]
+pub const STRUCT1: Struct1 = Struct1 { field: 1 };
+
+#[stable(feature = "stable_test_feature", since = "1.0.0")]
+pub const STRUCT2: Struct2 = Struct2 { field: 1 };
diff --git a/src/test/ui/stability-attribute/generics-default-stability.rs b/src/test/ui/stability-attribute/generics-default-stability.rs
index 8a8ee90dc00e6..0963bbec76bdc 100644
--- a/src/test/ui/stability-attribute/generics-default-stability.rs
+++ b/src/test/ui/stability-attribute/generics-default-stability.rs
@@ -2,7 +2,7 @@
 
 extern crate unstable_generic_param;
 
-use unstable_generic_param::{Trait1, Trait2};
+use unstable_generic_param::*;
 
 struct R;
 
@@ -22,4 +22,30 @@ impl Trait2<usize> for S {
 
 fn main() {
     let _ = S;
+
+    let _ = Struct1 { field: 1 }; //~ ERROR use of unstable library feature 'unstable_default'
+    let _: Struct1 = Struct1 { field: 1 }; //~ ERROR use of unstable library feature 'unstable_default'
+    let _: Struct1<usize> = Struct1 { field: 1 }; //~ ERROR use of unstable library feature 'unstable_default'
+
+    let _ = STRUCT1;
+    let _: Struct1 = STRUCT1; // ok
+    let _: Struct1<usize> = STRUCT1; //~ ERROR use of unstable library feature 'unstable_default'
+    let _: Struct1<usize> = STRUCT1; //~ ERROR use of unstable library feature 'unstable_default'
+    let _ = STRUCT1.field; // ok
+    let _: usize = STRUCT1.field; //~ ERROR use of unstable library feature 'unstable_default'
+    let _ = STRUCT1.field + 1; //~ ERROR use of unstable library feature 'unstable_default'
+    let _ = STRUCT1.field + 1usize; //~ ERROR use of unstable library feature 'unstable_default'
+
+    let _ = Struct2 { field: 1 }; // ok
+    let _: Struct2 = Struct2 { field: 1 }; // ok
+    let _: Struct2<usize> = Struct2 { field: 1 }; // ok
+
+    let _ = STRUCT2;
+    let _: Struct2 = STRUCT2; // ok
+    let _: Struct2<usize> = STRUCT2; // ok
+    let _: Struct2<usize> = STRUCT2; // ok
+    let _ = STRUCT2.field; // ok
+    let _: usize = STRUCT2.field; // ok
+    let _ = STRUCT2.field + 1; // ok
+    let _ = STRUCT2.field + 1usize; // ok
 }