Additional trait default parameter stability tests

Author: Avi-D-coder

src/test/ui/stability-attribute/auxiliary/unstable_generic_param.rs

@@ -10,7 +10,13 @@ pub trait Trait1<#[unstable(feature = "unstable_default", issue = "none")] T = (
 }
 
 #[stable(feature = "stable_test_feature", since = "1.0.0")]
-pub trait Trait2<T = ()> {
+pub trait Trait2<#[unstable(feature = "unstable_default", issue = "none")] T = usize> {
+    #[stable(feature = "stable_test_feature", since = "1.0.0")]
+    fn foo() -> T;
+}
+
+#[stable(feature = "stable_test_feature", since = "1.0.0")]
+pub trait Trait3<T = ()> {
     #[stable(feature = "stable_test_feature", since = "1.0.0")]
     fn foo() -> T;
 }

src/test/ui/stability-attribute/generics-default-stability.rs

@@ -16,7 +16,15 @@ impl Trait1<usize> for S { //~ ERROR use of unstable library feature 'unstable_d
     fn foo() -> usize { 0 }
 }
 
-impl Trait2<usize> for S {
+impl Trait1<isize> for S { //~ ERROR use of unstable library feature 'unstable_default'
+    fn foo() -> usize { 0 }
+}
+
+impl Trait2<usize> for S { //~ ERROR use of unstable library feature 'unstable_default'
+    fn foo() -> usize { 0 }
+}
+
+impl Trait3<usize> for S {
     fn foo() -> usize { 0 } // ok
 }
 
@@ -25,9 +33,9 @@ fn main() {
 
     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<isize> = Struct1 { field: 1 }; //~ ERROR use of unstable library feature 'unstable_default'
 
-    let _ = STRUCT1;
+    let _ = STRUCT1; // ok
     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'

src/test/ui/stability-attribute/generics-default-stability.stderr

@@ -6,6 +6,22 @@ LL | impl Trait1<usize> for S {
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
 
-error: aborting due to previous error
+error[E0658]: use of unstable library feature 'unstable_default'
+  --> $DIR/generics-default-stability.rs:19:13
+   |
+LL | impl Trait1<isize> for S {
+   |             ^^^^^
+   |
+   = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+
+error[E0658]: use of unstable library feature 'unstable_default'
+  --> $DIR/generics-default-stability.rs:23:13
+   |
+LL | impl Trait2<usize> for S {
+   |             ^^^^^
+   |
+   = help: add `#![feature(unstable_default)]` to the crate attributes to enable
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0658`.