Add tests

src/test/ui/inline-const/expr-unsafe-err.mir.stderr

@@ -0,0 +1,11 @@
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> $DIR/expr-unsafe-err.rs:8:9
+   |
+LL |         require_unsafe();
+   |         ^^^^^^^^^^^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0133`.

src/test/ui/inline-const/expr-unsafe-err.rs

@@ -0,0 +1,11 @@
+// revisions: mir thir
+// [thir]compile-flags: -Z thir-unsafeck
+#![feature(inline_const)]
+const unsafe fn require_unsafe() -> usize { 1 }
+
+fn main() {
+    const {
+        require_unsafe();
+        //~^ ERROR [E0133]
+    }
+}

src/test/ui/inline-const/expr-unsafe-err.thir.stderr

@@ -0,0 +1,11 @@
+error[E0133]: call to unsafe function `require_unsafe` is unsafe and requires unsafe function or block
+  --> $DIR/expr-unsafe-err.rs:8:9
+   |
+LL |         require_unsafe();
+   |         ^^^^^^^^^^^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0133`.

src/test/ui/inline-const/expr-unsafe.mir.stderr

@@ -0,0 +1,14 @@
+warning: unnecessary `unsafe` block
+  --> $DIR/expr-unsafe.rs:12:13
+   |
+LL |             unsafe {}
+   |             ^^^^^^ unnecessary `unsafe` block
+   |
+note: the lint level is defined here
+  --> $DIR/expr-unsafe.rs:4:9
+   |
+LL | #![warn(unused_unsafe)]
+   |         ^^^^^^^^^^^^^
+
+warning: 1 warning emitted
+

src/test/ui/inline-const/expr-unsafe.rs

@@ -0,0 +1,16 @@
+// check-pass
+// revisions: mir thir
+// [thir]compile-flags: -Z thir-unsafeck
+#![warn(unused_unsafe)]
+#![feature(inline_const)]
+const unsafe fn require_unsafe() -> usize { 1 }
+
+fn main() {
+    unsafe {
+        const {
+            require_unsafe();
+            unsafe {}
+            //~^ WARNING unnecessary `unsafe` block
+        }
+    }
+}

src/test/ui/inline-const/expr-unsafe.thir.stderr

@@ -0,0 +1,17 @@
+warning: unnecessary `unsafe` block
+  --> $DIR/expr-unsafe.rs:12:13
+   |
+LL |     unsafe {
+   |     ------ because it's nested under this `unsafe` block
+...
+LL |             unsafe {}
+   |             ^^^^^^ unnecessary `unsafe` block
+   |
+note: the lint level is defined here
+  --> $DIR/expr-unsafe.rs:4:9
+   |
+LL | #![warn(unused_unsafe)]
+   |         ^^^^^^^^^^^^^
+
+warning: 1 warning emitted
+