Improve tests for FFI attr validation

Author: inquisitivecrystal

tests/ui/ffi_const.rs

@@ -3,3 +3,13 @@
 
 #[ffi_const] //~ ERROR `#[ffi_const]` may only be used on foreign functions
 pub fn foo() {}
+
+#[ffi_const] //~ ERROR `#[ffi_const]` may only be used on foreign functions
+macro_rules! bar {
+    () => ()
+}
+
+extern "C" {
+    #[ffi_const] //~ ERROR `#[ffi_const]` may only be used on foreign functions
+    static INT: i32;
+}

tests/ui/ffi_const.stderr

@@ -4,6 +4,18 @@ error[E0756]: `#[ffi_const]` may only be used on foreign functions
 LL | #[ffi_const]
    | ^^^^^^^^^^^^
 
-error: aborting due to previous error
+error[E0756]: `#[ffi_const]` may only be used on foreign functions
+  --> $DIR/ffi_const.rs:7:1
+   |
+LL | #[ffi_const]
+   | ^^^^^^^^^^^^
+
+error[E0756]: `#[ffi_const]` may only be used on foreign functions
+  --> $DIR/ffi_const.rs:13:5
+   |
+LL |     #[ffi_const]
+   |     ^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0756`.

tests/ui/ffi_pure.rs

@@ -3,3 +3,13 @@
 
 #[ffi_pure] //~ ERROR `#[ffi_pure]` may only be used on foreign functions
 pub fn foo() {}
+
+#[ffi_pure] //~ ERROR `#[ffi_pure]` may only be used on foreign functions
+macro_rules! bar {
+    () => ()
+}
+
+extern "C" {
+    #[ffi_pure] //~ ERROR `#[ffi_pure]` may only be used on foreign functions
+    static INT: i32;
+}

tests/ui/ffi_pure.stderr

@@ -4,6 +4,18 @@ error[E0755]: `#[ffi_pure]` may only be used on foreign functions
 LL | #[ffi_pure]
    | ^^^^^^^^^^^
 
-error: aborting due to previous error
+error[E0755]: `#[ffi_pure]` may only be used on foreign functions
+  --> $DIR/ffi_pure.rs:7:1
+   |
+LL | #[ffi_pure]
+   | ^^^^^^^^^^^
+
+error[E0755]: `#[ffi_pure]` may only be used on foreign functions
+  --> $DIR/ffi_pure.rs:13:5
+   |
+LL |     #[ffi_pure]
+   |     ^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0755`.

tests/ui/ffi_returns_twice.rs

@@ -3,3 +3,13 @@
 
 #[ffi_returns_twice] //~ ERROR `#[ffi_returns_twice]` may only be used on foreign functions
 pub fn foo() {}
+
+#[ffi_returns_twice] //~ ERROR `#[ffi_returns_twice]` may only be used on foreign functions
+macro_rules! bar {
+    () => ()
+}
+
+extern "C" {
+    #[ffi_returns_twice] //~ ERROR `#[ffi_returns_twice]` may only be used on foreign functions
+    static INT: i32;
+}

tests/ui/ffi_returns_twice.stderr

@@ -4,6 +4,18 @@ error[E0724]: `#[ffi_returns_twice]` may only be used on foreign functions
 LL | #[ffi_returns_twice]
    | ^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+error[E0724]: `#[ffi_returns_twice]` may only be used on foreign functions
+  --> $DIR/ffi_returns_twice.rs:7:1
+   |
+LL | #[ffi_returns_twice]
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error[E0724]: `#[ffi_returns_twice]` may only be used on foreign functions
+  --> $DIR/ffi_returns_twice.rs:13:5
+   |
+LL |     #[ffi_returns_twice]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0724`.