Add test for coverage on a body-less trait function

Author: ehuss

tests/coverage/attr/trait-impl-inherit.cov-map

@@ -1,9 +1,9 @@
 Function name: <trait_impl_inherit::S as trait_impl_inherit::T>::f
-Raw bytes (9): 0x[01, 01, 00, 01, 01, 0f, 05, 02, 06]
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 10, 05, 02, 06]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 0
 Number of file 0 mappings: 1
-- Code(Counter(0)) at (prev + 15, 5) to (start + 2, 6)
+- Code(Counter(0)) at (prev + 16, 5) to (start + 2, 6)
 Highest counter ID seen: c0
 

tests/coverage/attr/trait-impl-inherit.coverage

@@ -1,5 +1,6 @@
    LL|       |// Checks that `#[coverage(..)]` in a trait method is not inherited in an
    LL|       |// implementation.
+   LL|       |//@ edition: 2021
    LL|       |//@ reference: attributes.coverage.trait-impl-inherit
    LL|       |
    LL|       |trait T {

tests/coverage/attr/trait-impl-inherit.rs

@@ -1,5 +1,6 @@
 // Checks that `#[coverage(..)]` in a trait method is not inherited in an
 // implementation.
+//@ edition: 2021
 //@ reference: attributes.coverage.trait-impl-inherit
 
 trait T {

tests/ui/coverage-attr/no-coverage.rs

@@ -14,6 +14,12 @@ trait Trait {
     type T;
 
     type U;
+
+    #[coverage(off)] //~ ERROR attribute should be applied to a function definition or closure
+    fn f(&self);
+
+    #[coverage(off)] //~ ERROR attribute should be applied to a function definition or closure
+    fn g();
 }
 
 #[coverage(off)]
@@ -25,6 +31,9 @@ impl Trait for () {
 
     #[coverage(off)] //~ ERROR attribute should be applied to a function definition or closure
     type U = impl Trait; //~ ERROR unconstrained opaque type
+
+    fn f(&self) {}
+    fn g() {}
 }
 
 extern "C" {

tests/ui/coverage-attr/no-coverage.stderr

@@ -7,28 +7,28 @@ LL | / trait Trait {
 LL | |     #[coverage(off)]
 LL | |     const X: u32;
 ...  |
-LL | |     type U;
+LL | |     fn g();
 LL | | }
    | |_- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:40:5
+  --> $DIR/no-coverage.rs:49:5
    |
 LL |     #[coverage(off)]
    |     ^^^^^^^^^^^^^^^^
 LL |     let _ = ();
    |     ----------- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:44:9
+  --> $DIR/no-coverage.rs:53:9
    |
 LL |         #[coverage(off)]
    |         ^^^^^^^^^^^^^^^^
 LL |         () => (),
    |         -------- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:48:5
+  --> $DIR/no-coverage.rs:57:5
    |
 LL |     #[coverage(off)]
    |     ^^^^^^^^^^^^^^^^
@@ -52,45 +52,61 @@ LL |     type T;
    |     ------- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:23:5
+  --> $DIR/no-coverage.rs:18:5
+   |
+LL |     #[coverage(off)]
+   |     ^^^^^^^^^^^^^^^^
+LL |     fn f(&self);
+   |     ------------ not a function or closure
+
+error[E0788]: attribute should be applied to a function definition or closure
+  --> $DIR/no-coverage.rs:21:5
+   |
+LL |     #[coverage(off)]
+   |     ^^^^^^^^^^^^^^^^
+LL |     fn g();
+   |     ------- not a function or closure
+
+error[E0788]: attribute should be applied to a function definition or closure
+  --> $DIR/no-coverage.rs:29:5
    |
 LL |     #[coverage(off)]
    |     ^^^^^^^^^^^^^^^^
 LL |     type T = Self;
    |     -------------- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:26:5
+  --> $DIR/no-coverage.rs:32:5
    |
 LL |     #[coverage(off)]
    |     ^^^^^^^^^^^^^^^^
 LL |     type U = impl Trait;
    |     -------------------- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:31:5
+  --> $DIR/no-coverage.rs:40:5
    |
 LL |     #[coverage(off)]
    |     ^^^^^^^^^^^^^^^^
 LL |     static X: u32;
    |     -------------- not a function or closure
 
 error[E0788]: attribute should be applied to a function definition or closure
-  --> $DIR/no-coverage.rs:34:5
+  --> $DIR/no-coverage.rs:43:5
    |
 LL |     #[coverage(off)]
    |     ^^^^^^^^^^^^^^^^
 LL |     type T;
    |     ------- not a function or closure
 
 error: unconstrained opaque type
-  --> $DIR/no-coverage.rs:27:14
+  --> $DIR/no-coverage.rs:33:14
    |
 LL |     type U = impl Trait;
    |              ^^^^^^^^^^
    |
    = note: `U` must be used in combination with a concrete type within the same impl
 
-error: aborting due to 11 previous errors
+error: aborting due to 13 previous errors
 
 For more information about this error, try `rustc --explain E0788`.