diff --git a/tests/sema/error_messages/errors.zig b/tests/sema/error_messages/errors.zig
new file mode 100644
index 000000000..6d46155d2
--- /dev/null
+++ b/tests/sema/error_messages/errors.zig
@@ -0,0 +1,2 @@
+const ErrorUnion = type!void;
+//                 ^^^^ error: expected error set type, found 'type'
diff --git a/tests/sema/error_messages/optionals.zig b/tests/sema/error_messages/optionals.zig
index ae3a7b2d0..4663e1000 100644
--- a/tests/sema/error_messages/optionals.zig
+++ b/tests/sema/error_messages/optionals.zig
@@ -1,9 +1,13 @@
 const some_value: ?u32 = 5;
 const no_value: ?u32 = null;
 const undefined_value: ?u32 = undefined;
+const not_opt_value: u32 = 0;
 
 const null_unwrap = no_value.?;
 //                  ^^^^^^^^^^ error: tried to unwrap optional of type `u32` which was null
 
 const undefined_unwrap = undefined_value.?;
 //                       ^^^^^^^^^^^^^^^^^ error: tried to unwrap optional of type `u32` which was undefined
+
+const invalid_unwrap = not_opt_value.?;
+//                     ^^^^^^^^^^^^^^^ error: expected optional type, found 'u32'