Update testother.cpp

Author: chrchr-github

test/testother.cpp

@@ -4201,6 +4201,14 @@ class TestOther : public TestFixture {
               "    }\n"
               "}\n");
         ASSERT_EQUALS("", errout_str());
+
+        check("struct S {\n" // #15087
+              "    int a, b;\n"
+              "};\n"
+              "int& f(S& s, bool b) {\n"
+              "    return b ? s.a : s.b;\n"
+              "}\n");
+        ASSERT_EQUALS("", errout_str());
     }
 
     void constParameterCallback() {