Add some regression tests

src/test/ui/asm/issue-54067.rs

@@ -0,0 +1,12 @@
+// check-pass
+// ignore-emscripten no llvm_asm! support
+
+#![feature(llvm_asm)]
+
+pub fn boot(addr: Option<u32>) {
+    unsafe {
+        llvm_asm!("mov sp, $0"::"r" (addr));
+    }
+}
+
+fn main() {}

src/test/ui/async-await/issues/auxiliary/issue_67893.rs

@@ -0,0 +1,10 @@
+// edition:2018
+
+use std::sync::{Arc, Mutex};
+
+pub async fn f(_: ()) {}
+
+pub async fn run() {
+    let x: Arc<Mutex<()>> = unimplemented!();
+    f(*x.lock().unwrap()).await;
+}

src/test/ui/async-await/issues/issue-67893.rs

@@ -0,0 +1,13 @@
+// aux-build: issue_67893.rs
+// edition:2018
+// dont-check-compiler-stderr
+// FIXME(#71222): Add above flag because of the difference of stderrs on some env.
+
+extern crate issue_67893;
+
+fn g(_: impl Send) {}
+
+fn main() {
+    g(issue_67893::run())
+    //~^ ERROR: `std::sync::MutexGuard<'_, ()>` cannot be sent between threads safely
+}

src/test/ui/intrinsics/issue-28575.rs

@@ -0,0 +1,9 @@
+#![feature(intrinsics)]
+
+extern "C" {
+    pub static FOO: extern "rust-intrinsic" fn();
+}
+
+fn main() {
+    FOO() //~ ERROR: use of extern static is unsafe
+}

src/test/ui/intrinsics/issue-28575.stderr

@@ -0,0 +1,11 @@
+error[E0133]: use of extern static is unsafe and requires unsafe function or block
+  --> $DIR/issue-28575.rs:8:5
+   |
+LL |     FOO()
+   |     ^^^ use of extern static
+   |
+   = note: extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0133`.

src/test/ui/static/auxiliary/issue_24843.rs

@@ -0,0 +1 @@
+pub static TEST_STR: &'static str = "Hello world";

src/test/ui/static/issue-24843.rs

@@ -0,0 +1,8 @@
+// aux-build: issue_24843.rs
+// check-pass
+
+extern crate issue_24843;
+
+static _TEST_STR_2: &'static str = &issue_24843::TEST_STR;
+
+fn main() {}