add tests and fix comments

3 files changed, 38 insertions, 0 deletions

diff --git a/src/test/codegen/used_with_arg.rs b/src/test/codegen/used_with_arg.rs
new file mode 100644
index 00000000000..cd759b167c0
--- /dev/null
+++ b/src/test/codegen/used_with_arg.rs
@@ -0,0 +1,12 @@
+// compile-flags: -O
+
+#![crate_type = "lib"]
+#![feature(used_with_arg)]
+
+// CHECK: @llvm.used = appending global [1 x i8*]
+#[used(linker)]
+static mut USED_LINKER: [usize; 1] = [0];
+
+// CHECK-NEXT: @llvm.compiler.used = appending global [1 x i8*]
+#[used(compiler)]
+static mut USED_COMPILER: [usize; 1] = [0];
diff --git a/src/test/ui/feature-gates/feature-gate-used_with_arg.rs b/src/test/ui/feature-gates/feature-gate-used_with_arg.rs
new file mode 100644
index 00000000000..1c8f01bdef1
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-used_with_arg.rs
@@ -0,0 +1,7 @@
+#[used(linker)] //~ ERROR `#[used(linker)]` is currently unstable
+static mut USED_LINKER: [usize; 1] = [0];
+
+#[used(compiler)] //~ ERROR `#[used(compiler)]` is currently unstable
+static mut USED_COMPILER: [usize; 1] = [0];
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-used_with_arg.stderr b/src/test/ui/feature-gates/feature-gate-used_with_arg.stderr
new file mode 100644
index 00000000000..aaf4ceaf795
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-used_with_arg.stderr
@@ -0,0 +1,19 @@
+error[E0658]: `#[used(linker)]` is currently unstable
+  --> $DIR/feature-gate-used_with_arg.rs:1:1
+   |
+LL | #[used(linker)]
+   | ^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(used_with_arg)]` to the crate attributes to enable
+
+error[E0658]: `#[used(compiler)]` is currently unstable
+  --> $DIR/feature-gate-used_with_arg.rs:4:1
+   |
+LL | #[used(compiler)]
+   | ^^^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(used_with_arg)]` to the crate attributes to enable
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0658`.