test: added testcase ui/attributes/inline/rustc-force-inline-conflict-with-inline

Author: tahadostifam

tests/ui/attributes/inline/rustc-force-inline-conflict-with-inline.rs

@@ -0,0 +1,11 @@
+#![feature(rustc_attrs)]
+
+#[inline] //~ NOTE: the inline attribute is specified here
+#[rustc_force_inline] //~ ERROR: cannot be used together
+fn foo() {}
+
+#[rustc_force_inline] //~ ERROR: cannot be used together
+#[inline] //~ NOTE: the inline attribute is specified here
+fn bar() {}
+
+fn main() {}

tests/ui/attributes/inline/rustc-force-inline-conflict-with-inline.stderr

@@ -0,0 +1,18 @@
+error: `#[rustc_force_inline]` and `#[inline]` cannot be used together
+  --> $DIR/rustc-force-inline-conflict-with-inline.rs:4:1
+   |
+LL | #[inline]
+   | --------- the inline attribute is specified here
+LL | #[rustc_force_inline]
+   | ^^^^^^^^^^^^^^^^^^^^^
+
+error: `#[rustc_force_inline]` and `#[inline]` cannot be used together
+  --> $DIR/rustc-force-inline-conflict-with-inline.rs:7:1
+   |
+LL | #[rustc_force_inline]
+   | ^^^^^^^^^^^^^^^^^^^^^
+LL | #[inline]
+   | --------- the inline attribute is specified here
+
+error: aborting due to 2 previous errors
+