diff --git a/src/lib/format-util.hpp b/src/lib/format-util.hpp
index 099fb1d0f..3d926e9f5 100644
--- a/src/lib/format-util.hpp
+++ b/src/lib/format-util.hpp
@@ -194,7 +194,6 @@ namespace util {
     using Coll = typename lib::meta::Strip<CON>::TypePlain;
     _RangeIter<Coll> range(std::forward<CON>(coll));
     
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
     auto strings = stringify (std::move (range.iter));
     if (!strings) return "";
     
@@ -206,8 +205,6 @@ namespace util {
     size_t len = buffer.str().length();
     ASSERT (len >= delim.length());
     return buffer.str().substr(0, len - delim.length());
-#endif   //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
-    return "bääh";
   }
   
   template<class X>
diff --git a/src/lib/meta/function.hpp b/src/lib/meta/function.hpp
index 1075c197c..5ac064e8d 100644
--- a/src/lib/meta/function.hpp
+++ b/src/lib/meta/function.hpp
@@ -129,6 +129,13 @@ namespace meta{
       using Sig  = RET(ARGS...);
       using Functor = std::function<Sig>;
     };
+  
+  /** Specialisation to strip `noexcept` from the signature */
+  template<typename RET, typename...ARGS>
+  struct _Fun<RET(ARGS...) noexcept>
+    : _Fun<RET(ARGS...)>
+    { };
+  
   /** Specialisation for using a function pointer */
   template<typename SIG>
   struct _Fun<SIG*>
@@ -153,6 +160,12 @@ namespace meta{
     : _Fun<RET(ARGS...)>
     { };
   
+  /** Specialisation to deal with member pointer to noexcept function */
+  template<class C, typename RET, typename...ARGS>
+  struct _Fun<RET (C::*) (ARGS...) noexcept>
+    : _Fun<RET(ARGS...)>
+    { };
+  
   /** Specialisation to handle member pointer to const function;
    *  indirectly this specialisation also handles lambdas,
    *  as redirected by the main template (via `decltype`) */
diff --git a/tests/library/diff/tree-mutator-binding-test.cpp b/tests/library/diff/tree-mutator-binding-test.cpp
index 093427a08..8059810b8 100644
--- a/tests/library/diff/tree-mutator-binding-test.cpp
+++ b/tests/library/diff/tree-mutator-binding-test.cpp
@@ -408,10 +408,7 @@ namespace test{
           
           mutator1.injectNew (ATTRIB1);
           CHECK (!isnil (target));
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           CHECK (contains(join(target), "≺α∣1≻"));
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
-  UNIMPLEMENTED ("C++17");
           
           mutator1.injectNew (ATTRIB3);
           mutator1.injectNew (ATTRIB3);
@@ -420,7 +417,6 @@ namespace test{
           mutator1.injectNew (CHILD_T);
           CHECK (mutator1.completeScope());
           
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           auto contents = stringify(eachElm(target));
           CHECK ("≺α∣1≻" == *contents);
           ++contents;
@@ -435,8 +431,6 @@ namespace test{
           CHECK (contains(*contents, "∣78:56:34.012≻"));
           ++contents;
           CHECK (isnil (contents));
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
-  UNIMPLEMENTED ("C++17");
           
           cout << "injected......" << join(target) <<endl;
           
@@ -504,7 +498,6 @@ namespace test{
           CHECK (mutator2.completeScope());         // no pending elements left, everything resolved
           
           // verify reordered shape
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           contents = stringify(eachElm(target));
           CHECK ("≺α∣1≻" == *contents);
           ++contents;
@@ -521,7 +514,6 @@ namespace test{
           CHECK (contains(*contents, "∣b≻"));
           ++contents;
           CHECK (isnil (contents));
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           
           cout << "Content after reordering...."
                << join(target) <<endl;
@@ -625,7 +617,6 @@ namespace test{
           cout << "Sub|" << join(subScopes[SUB_NODE.idi]) <<endl;  //  some new content into our implementation defined sub scope!
           
           // verify contents of nested scope after mutation
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           contents = stringify(eachElm(subScopes[SUB_NODE.idi]));
           CHECK ("≺type∣ξ≻" == *contents);
           ++contents;
@@ -636,7 +627,6 @@ namespace test{
           CHECK (contains(*contents, "∣a≻"));
           ++contents;
           CHECK (isnil (contents));
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           
           
           // now back to parent scope....
@@ -654,7 +644,6 @@ namespace test{
           cout << "Sub|" << join(subScopes[ATTRIB_NODE.idi]) <<endl;
           
           // verify contents of this second nested scope
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           contents = stringify(eachElm(subScopes[ATTRIB_NODE.idi]));
           CHECK ("≺type∣ζ≻" == *contents);
           ++contents;
@@ -665,7 +654,6 @@ namespace test{
           CHECK (contains(*contents, "∣a≻"));
           ++contents;
           CHECK (isnil (contents));
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           
           
           // back to parent scope....
diff --git a/tests/library/format-helper-test.cpp b/tests/library/format-helper-test.cpp
index 64a4b8b8a..be22577ea 100644
--- a/tests/library/format-helper-test.cpp
+++ b/tests/library/format-helper-test.cpp
@@ -139,7 +139,6 @@ namespace test {
       checkStringify()
         {
           // use as transformer within an (iterator) pipeline
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           auto ss = stringify (eachNum (1.11, 10.2));
           
           CHECK (ss);
@@ -152,8 +151,6 @@ namespace test {
             res += s;
           
           CHECK (res == "..2.113.114.115.116.117.118.119.1110.11");
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
-  UNIMPLEMENTED ("C++17");
           
           
           using VecS = vector<string>;
@@ -169,7 +166,6 @@ namespace test {
           ++nn;
           CHECK (6 == *nn);
           
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           auto sn = stringify (nn);
           CHECK ("6" == *sn);
           ++sn;
@@ -186,8 +182,6 @@ namespace test {
           CHECK ("9" == *sn);
           ++sn;
           CHECK (isnil (sn));
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
-  UNIMPLEMENTED ("C++17");
         }
       
       
diff --git a/tests/library/item-wrapper-test.cpp b/tests/library/item-wrapper-test.cpp
index 598d2b811..f336e066d 100644
--- a/tests/library/item-wrapper-test.cpp
+++ b/tests/library/item-wrapper-test.cpp
@@ -312,7 +312,6 @@ namespace test{
       void
       verifyFunctionResult()
         {
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
           FunctionResult<int(void)> randomVal (std::rand);
           
           // function was never invoked, thus the remembered result is NIL
@@ -331,8 +330,6 @@ namespace test{
           CHECK (v2 == *randomVal);
           CHECK (v2 == *randomVal);
           CHECK (v1 != *randomVal);
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
-  UNIMPLEMENTED ("C++17");
         }
       
       
diff --git a/tests/stage/test/test-nexus.cpp b/tests/stage/test/test-nexus.cpp
index 508372757..2eb38c2fd 100644
--- a/tests/stage/test/test-nexus.cpp
+++ b/tests/stage/test/test-nexus.cpp
@@ -496,11 +496,9 @@ namespace test{
           {
             EventLog::ArgSeq strings;
             strings.reserve (argData.childSize());
-#if false //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
             append_all (transformIterator (childData (argData.scope())
                                           , util::toString<DataCap>)
                        ,strings);
-#endif    //////////////////////////////////////////////////////////////////////////////////////////////////TICKET #1138 : sort out C++17 compatibility
             return strings;
           }
         
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 28d0baf5b..03d827485 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -45594,8 +45594,8 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1581995421239" ID="ID_1730281364" MODIFIED="1581995495636" TEXT="mutma&#xdf;liche Probleme">
-<icon BUILTIN="flag-pink"/>
+<node COLOR="#435e98" CREATED="1581995421239" ID="ID_1730281364" MODIFIED="1582312452693" TEXT="mutma&#xdf;liche Probleme">
+<icon BUILTIN="info"/>
 <node COLOR="#435e98" CREATED="1581995443649" ID="ID_986769823" MODIFIED="1582306722680" TEXT="STL collection duck detector greift nicht mehr">
 <icon BUILTIN="button_ok"/>
 <node CREATED="1582073183681" ID="ID_652495805" MODIFIED="1582073205034" TEXT="erkl&#xe4;rt Defekt">
@@ -45643,17 +45643,20 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1581995458449" ID="ID_524595490" MODIFIED="1582226929460" TEXT="meta::_Fun Type-Deduction greift nicht mehr">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#435e98" CREATED="1581995458449" ID="ID_524595490" MODIFIED="1582312410611" TEXT="meta::_Fun Type-Deduction greift nicht mehr">
+<icon BUILTIN="button_ok"/>
 <node CREATED="1582073209005" ID="ID_1128456119" MODIFIED="1582073212094" TEXT="erkl&#xe4;rt Defekt">
 <node CREATED="1581995542307" ID="ID_1935687224" MODIFIED="1581995545415" TEXT="transformIterator"/>
 <node CREATED="1581995546475" ID="ID_1004262725" MODIFIED="1581995552782" TEXT="stringify"/>
 <node CREATED="1581995553206" ID="ID_984495822" MODIFIED="1581995556030" TEXT="util::join"/>
 </node>
+<node CREATED="1582312412651" ID="ID_1422313569" MODIFIED="1582312440377" TEXT="ebenfalls durch Spezialisierung auf noexcept l&#xf6;sbar">
+<arrowlink COLOR="#8dbd97" DESTINATION="ID_698919272" ENDARROW="Default" ENDINCLINATION="551;0;" ID="Arrow_ID_1462827757" STARTARROW="None" STARTINCLINATION="551;0;"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1582226930039" ID="ID_520524824" MODIFIED="1582226984574" TEXT="Union-Initialisierung on-the-fly">
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1582226930039" ID="ID_520524824" MODIFIED="1582312457500" TEXT="Union-Initialisierung on-the-fly">
 <arrowlink COLOR="#ca99b1" DESTINATION="ID_1404034997" ENDARROW="Default" ENDINCLINATION="-5;81;" ID="Arrow_ID_402256801" STARTARROW="None" STARTINCLINATION="235;22;"/>
-<icon BUILTIN="flag-yellow"/>
+<icon BUILTIN="hourglass"/>
 </node>
 </node>
 <node CREATED="1582233568711" ID="ID_1046617766" MODIFIED="1582233574777" TEXT="L&#xf6;sungen">
@@ -45797,6 +45800,30 @@
 </node>
 </node>
 </node>
+<node COLOR="#338800" CREATED="1582312227006" ID="ID_1679109428" MODIFIED="1582312398197" TEXT="Funktions-Detektor">
+<icon BUILTIN="button_ok"/>
+<node CREATED="1582312235632" ID="ID_1383769424" MODIFIED="1582312241748" TEXT="es ist ebenfalls noexcept">
+<icon BUILTIN="idea"/>
+</node>
+<node COLOR="#338800" CREATED="1582312256096" ID="ID_698919272" MODIFIED="1582312433072" TEXT="l&#xe4;&#xdf;t sich mit forwarding-specialisation wegstrippen">
+<linktarget COLOR="#8dbd97" DESTINATION="ID_698919272" ENDARROW="Default" ENDINCLINATION="551;0;" ID="Arrow_ID_1462827757" SOURCE="ID_1422313569" STARTARROW="None" STARTINCLINATION="551;0;"/>
+<icon BUILTIN="button_ok"/>
+</node>
+<node CREATED="1582312269622" ID="ID_1014206981" LINK="https://stackoverflow.com/a/55701361/444796" MODIFIED="1582312395433" TEXT="Gefahr der kombinatorischen Explosion">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      mit const und volatile...
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="idea"/>
+</node>
+</node>
 </node>
 </node>
 </node>