Extend tests for references

Author: 1c3t3a

tests/ui/mir/null/addrof_null.rs

@@ -1,4 +1,4 @@
-// Make sure that we don't actually insert a check for `addr_of!`.
+// Make sure that we don't insert a check for `addr_of!`.
 //@ run-pass
 //@ compile-flags: -C debug-assertions
 

tests/ui/mir/null/place_without_read.rs

@@ -1,4 +1,4 @@
-// Make sure that we don't actually insert a check for places that do not read.
+// Make sure that we don't insert a check for places that do not read.
 //@ run-pass
 //@ compile-flags: -C debug-assertions
 

tests/ui/mir/null/references.rs

@@ -0,0 +1,16 @@
+// Make sure that we don't insert a check for references instead of pointers.
+//@ run-pass
+//@ compile-flags: -C debug-assertions
+
+struct Null {
+    a: u32,
+}
+
+fn main() {
+    let val: u32 = 42;
+    let val_ref: &u32 = &val;
+    let _access1: &u32 = &*val_ref;
+
+    let val = Null { a: 43 };
+    let _access2: &u32 = &val.a;
+}

tests/ui/mir/null/zero_sized_access.rs

@@ -1,5 +1,5 @@
-// Make sure that we don't actually insert a check for zero-sized reads or writes
-// to null, because they are actually allowed.
+// Make sure that we don't insert a check for zero-sized reads or writes to
+// null, because they are allowed.
 //@ run-pass
 //@ compile-flags: -C debug-assertions