Add test for misused #[rustc_must_implement_one_of]

Author: WaffleLapkin

src/test/ui/rustc_must_implement_one_of_misuse.rs

@@ -0,0 +1,38 @@
+#![feature(rustc_attrs)]
+
+#[rustc_must_implement_one_of(a, b)]
+//~^ Method not found in this trait
+//~| Method not found in this trait
+trait Tr0 {}
+
+#[rustc_must_implement_one_of(a, b)]
+//~^ Method not found in this trait
+trait Tr1 {
+    fn a() {}
+}
+
+#[rustc_must_implement_one_of(a)]
+//~^ the `#[rustc_must_implement_one_of]` attribute must be used with at least 2 args
+trait Tr2 {
+    fn a() {}
+}
+
+#[rustc_must_implement_one_of]
+//~^ malformed `rustc_must_implement_one_of` attribute input
+trait Tr3 {}
+
+#[rustc_must_implement_one_of(A, B)]
+trait Tr4 {
+    const A: u8 = 1; //~ Not a method
+
+    type B; //~ Not a method
+}
+
+#[rustc_must_implement_one_of(a, b)]
+trait Tr5 {
+    fn a(); //~ This method doesn't have a default implementation
+
+    fn b(); //~ This method doesn't have a default implementation
+}
+
+fn main() {}

src/test/ui/rustc_must_implement_one_of_misuse.stderr

@@ -0,0 +1,82 @@
+error: malformed `rustc_must_implement_one_of` attribute input
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:20:1
+   |
+LL | #[rustc_must_implement_one_of]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_must_implement_one_of(method1, method2, ...)]`
+
+error: Method not found in this trait
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:31
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   |                               ^
+
+error: Method not found in this trait
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:34
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   |                                  ^
+
+error: Method not found in this trait
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:8:34
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   |                                  ^
+
+error: the `#[rustc_must_implement_one_of]` attribute must be used with at least 2 args
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:14:1
+   |
+LL | #[rustc_must_implement_one_of(a)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: Not a method
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:26:5
+   |
+LL |     const A: u8 = 1;
+   |     ^^^^^^^^^^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:24:1
+   |
+LL | #[rustc_must_implement_one_of(A, B)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: All `#[rustc_must_implement_one_of]` arguments must be method identifiers
+
+error: Not a method
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:28:5
+   |
+LL |     type B;
+   |     ^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:24:1
+   |
+LL | #[rustc_must_implement_one_of(A, B)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: All `#[rustc_must_implement_one_of]` arguments must be method identifiers
+
+error: This method doesn't have a default implementation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:33:5
+   |
+LL |     fn a();
+   |     ^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:31:1
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: This method doesn't have a default implementation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:35:5
+   |
+LL |     fn b();
+   |     ^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:31:1
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 9 previous errors
+