--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/spellcheck-ns.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,22 @@
+// { dg-options "-fdiagnostics-show-caret" }
+
+namespace outer {
+  namespace inner_ns {
+  }
+  typedef int some_typedef;
+}
+
+using namespace outer;
+using namespace outer::inner_ms; // { dg-error "'inner_ms' is not a namespace-name; did you mean 'inner_ns'" }
+/* { dg-begin-multiline-output "" }
+ using namespace outer::inner_ms;
+                        ^~~~~~~~
+                        inner_ns
+   { dg-end-multiline-output "" } */
+
+outer::some_typedfe var; // { dg-error "'some_typedfe' in namespace 'outer' does not name a type; did you mean 'some_typedef'" }
+/* { dg-begin-multiline-output "" }
+ outer::some_typedfe var;
+        ^~~~~~~~~~~~
+        some_typedef
+   { dg-end-multiline-output "" } */