Extend test and fix nits
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2 changed files with 73 additions and 9 deletions
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@ -1,11 +1,11 @@
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// compile-fail
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#![feature(specialization)]
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#![feature(specialization, associated_type_defaults)]
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// Test that attempting to override a non-default method or one not in the
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// parent impl causes an error
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// parent impl causes an error.
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trait Foo {
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type Ty = ();
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const CONST: u8 = 123;
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fn foo(&self) -> bool { true }
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}
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@ -16,6 +16,8 @@ trait Foo {
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// Box<i32> Box<i64> Vec<()> Vec<bool>
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impl<T> Foo for Box<T> {
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type Ty = bool;
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const CONST: u8 = 0;
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fn foo(&self) -> bool { false }
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}
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@ -24,18 +26,26 @@ impl Foo for Box<i32> {}
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// Can't override a non-`default` fn
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impl Foo for Box<i64> {
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type Ty = Vec<()>;
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//~^ error: `Ty` specializes an item from a parent `impl`, but that item is not marked `default`
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const CONST: u8 = 42;
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//~^ error: `CONST` specializes an item from a parent `impl`, but that item is not marked `default`
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fn foo(&self) -> bool { true }
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//~^ error: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
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}
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// Doesn't mention the method = provided body is used and the method is final
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// Doesn't mention the item = provided body/value is used and the method is final.
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impl<T> Foo for Vec<T> {}
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// Allowed
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impl Foo for Vec<()> {}
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impl Foo for Vec<bool> {
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type Ty = Vec<()>;
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//~^ error: `Ty` specializes an item from a parent `impl`, but that item is not marked `default`
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const CONST: u8 = 42;
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//~^ error: `CONST` specializes an item from a parent `impl`, but that item is not marked `default`
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fn foo(&self) -> bool { true }
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//~^ error: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
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}
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@ -1,7 +1,39 @@
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error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:27:5
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error[E0520]: `Ty` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:29:5
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LL | / impl<T> Foo for Box<T> {
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LL | | type Ty = bool;
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LL | | const CONST: u8 = 0;
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LL | | fn foo(&self) -> bool { false }
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LL | | }
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| |_- parent `impl` is here
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...
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LL | type Ty = Vec<()>;
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| ^^^^^^^^^^^^^^^^^^ cannot specialize default item `Ty`
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= note: to specialize, `Ty` in the parent `impl` must be marked `default`
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error[E0520]: `CONST` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:31:5
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LL | / impl<T> Foo for Box<T> {
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LL | | type Ty = bool;
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LL | | const CONST: u8 = 0;
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LL | | fn foo(&self) -> bool { false }
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LL | | }
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| |_- parent `impl` is here
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...
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LL | const CONST: u8 = 42;
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| ^^^^^^^^^^^^^^^^^^^^^ cannot specialize default item `CONST`
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= note: to specialize, `CONST` in the parent `impl` must be marked `default`
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error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:33:5
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LL | / impl<T> Foo for Box<T> {
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LL | | type Ty = bool;
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LL | | const CONST: u8 = 0;
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LL | | fn foo(&self) -> bool { false }
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LL | | }
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| |_- parent `impl` is here
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@ -11,8 +43,30 @@ LL | fn foo(&self) -> bool { true }
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= note: to specialize, `foo` in the parent `impl` must be marked `default`
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error[E0520]: `Ty` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:45:5
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LL | impl<T> Foo for Vec<T> {}
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| ------------------------- parent `impl` is here
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...
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LL | type Ty = Vec<()>;
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| ^^^^^^^^^^^^^^^^^^ cannot specialize default item `Ty`
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= note: to specialize, `Ty` in the parent `impl` must be marked `default`
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error[E0520]: `CONST` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:47:5
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LL | impl<T> Foo for Vec<T> {}
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| ------------------------- parent `impl` is here
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...
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LL | const CONST: u8 = 42;
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| ^^^^^^^^^^^^^^^^^^^^^ cannot specialize default item `CONST`
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= note: to specialize, `CONST` in the parent `impl` must be marked `default`
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error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
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--> $DIR/specialization-default-methods-fail.rs:39:5
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--> $DIR/specialization-default-methods-fail.rs:49:5
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LL | impl<T> Foo for Vec<T> {}
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| ------------------------- parent `impl` is here
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@ -22,6 +76,6 @@ LL | fn foo(&self) -> bool { true }
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= note: to specialize, `foo` in the parent `impl` must be marked `default`
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error: aborting due to 2 previous errors
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error: aborting due to 6 previous errors
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For more information about this error, try `rustc --explain E0520`.
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