diff --git a/src/gui/interact/ui-coord-resolver.hpp b/src/gui/interact/ui-coord-resolver.hpp
index a76371356..6c1ae1ffb 100644
--- a/src/gui/interact/ui-coord-resolver.hpp
+++ b/src/gui/interact/ui-coord-resolver.hpp
@@ -214,6 +214,14 @@ namespace interact {
           attempt_trivialResolution();
         }
       
+      UICoordResolver (UICoord && uic, LocationQuery& queryAPI)
+        : Builder{std::move(uic)}
+        , query_{queryAPI}
+        , res_{}
+        {
+          attempt_trivialResolution();
+        }
+      
       
       /* === query functions === */
       
@@ -297,7 +305,7 @@ namespace interact {
        * @note if the coordinate spec can not be covered at all,
        *    it will be truncated to zero size
        */
-      UICoordResolver
+      UICoordResolver&&
       cover()
         {
           if (isCoveredPartially() and not res_.covfefe)
@@ -335,7 +343,7 @@ namespace interact {
        *  use the anchorage as indicated by that resolution,
        *  without interpolating the rest of the path.
        */
-      UICoordResolver
+      UICoordResolver&&
       anchor()
         {
           if (canAnchor())
@@ -346,7 +354,7 @@ namespace interact {
       
       /** mutate the path to extend it while keeping it partially covered
        */
-      UICoordResolver
+      UICoordResolver&&
       extend (Literal pathExtension)
         {
           if (not isCovered())
diff --git a/src/gui/interact/ui-coord.hpp b/src/gui/interact/ui-coord.hpp
index a6504e1f3..76dbc5d1c 100644
--- a/src/gui/interact/ui-coord.hpp
+++ b/src/gui/interact/ui-coord.hpp
@@ -491,7 +491,7 @@ namespace interact {
       
       /** change UI coordinate spec to define it to be rooted within the given window
        * @note this function allows to _undefine_ the window, thus creating an incomplete spec */
-      Builder
+      Builder&&
       window (Literal windowID)
         {
           uic_.setComponent (UIC_WINDOW, windowID);
@@ -499,7 +499,7 @@ namespace interact {
         }
       
       /** augment UI coordinates to mandate a specific perspective to be active within the window */
-      Builder
+      Builder&&
       persp (Literal perspectiveID)
         {
           uic_.setComponent (UIC_PERSP, perspectiveID);
@@ -507,7 +507,7 @@ namespace interact {
         }
       
       /** augment UI coordinates to indicate a specific view to be used */
-      Builder
+      Builder&&
       panel (Literal panelID)
         {
           uic_.setComponent (UIC_PANEL, panelID);
@@ -515,7 +515,7 @@ namespace interact {
         }
 
       /** augment UI coordinates to indicate a specific view to be used */
-      Builder
+      Builder&&
       view (Literal viewID)
         {
           uic_.setComponent (UIC_VIEW, viewID);
@@ -523,7 +523,7 @@ namespace interact {
         }
       
       /** augment UI coordinates to indicate a specific tab within the view" */
-      Builder
+      Builder&&
       tab (Literal tabID)
         {
           uic_.setComponent (UIC_TAB, tabID);
@@ -531,7 +531,7 @@ namespace interact {
         }
       
       /** augment UI coordinates to indicate a tab specified by index number */
-      Builder
+      Builder&&
       tab (uint tabIdx)
         {
           uic_.setComponent (UIC_TAB, Symbol{"#"+util::toString (tabIdx)});
@@ -540,7 +540,7 @@ namespace interact {
       
       /** augment UI coordinates to indicate that no tab specification is necessary
        * @remarks typically this happens when a panel just holds a simple view */
-      Builder
+      Builder&&
       noTab()
         {
           uic_.setComponent (UIC_TAB, UIC_ELIDED);
@@ -552,7 +552,7 @@ namespace interact {
        * @note the element might define a sequence of components separated by `'/'`,
        *       in which case several elements will be appended.
        */
-      Builder
+      Builder&&
       append (Literal elm)
         {
           if (not isnil(elm))
@@ -561,7 +561,7 @@ namespace interact {
         }
       
       /** augment partially defined UI coordinates by extending them towards the root */
-      Builder
+      Builder&&
       prepend (Literal elmID)
         {
           if (not uic_.isIncomplete())
@@ -577,7 +577,7 @@ namespace interact {
        * @param pathDef a path, possibly with multiple components separated by `'/'`
        * @note any existing path definition is completely replaced by the new path
        */
-      Builder
+      Builder&&
       path (Literal pathDef)
         {
           uic_.setTailSequence (UIC_PATH, pathDef);
@@ -585,7 +585,7 @@ namespace interact {
         }
 
       /** possibly shorten this path specification to a limited depth */
-      Builder
+      Builder&&
       truncateTo (size_t depth)
         {
           uic_.truncateTo (depth);
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 76c03f041..d257e74d6 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -9281,8 +9281,43 @@
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1515287694871" ID="ID_953283273" MODIFIED="1515287741026" TEXT="schon berechnet: eintragen">
 <icon BUILTIN="flag-yellow"/>
 <node CREATED="1515291343277" ID="ID_1704851738" MODIFIED="1515291349128" TEXT="explizites Cover machen"/>
-<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1515291350332" ID="ID_219986282" MODIFIED="1515291362081" TEXT="neue coverDepth mu&#xdf; sichtbar werden">
-<icon BUILTIN="flag-pink"/>
+<node COLOR="#338800" CREATED="1515291350332" ID="ID_219986282" MODIFIED="1515298798947" TEXT="neue coverDepth mu&#xdf; sichtbar werden">
+<icon BUILTIN="button_ok"/>
+<node CREATED="1515298565483" ID="ID_719457405" MODIFIED="1515298571802" TEXT="Autsch">
+<icon BUILTIN="smily_bad"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1515298572994" ID="ID_1082678541" MODIFIED="1515298599961" TEXT="Denkfehler im Builder-Konzept!">
+<icon BUILTIN="broken-line"/>
+<node CREATED="1515298602326" ID="ID_13919667" MODIFIED="1515298692557" TEXT="R&#xfc;ckgabe ist Value...">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      ...und das hei&#223;t.
+    </p>
+    <p>
+      ein Value wird auch sofort konstruiert,
+    </p>
+    <p>
+      egal, ob man den dann gleich wegwirft.
+    </p>
+  </body>
+</html></richcontent>
+</node>
+<node CREATED="1515298698849" ID="ID_1957524269" MODIFIED="1515298709411" TEXT="Objekt wird nach erstem Aufruf tats&#xe4;chlich zerst&#xf6;rt"/>
+</node>
+<node COLOR="#338800" CREATED="1515298710952" ID="ID_167586553" MODIFIED="1515298806412" TEXT="L&#xf6;sung: &amp;&amp; zur&#xfc;ckgeben">
+<icon BUILTIN="button_ok"/>
+</node>
+<node CREATED="1515298722702" ID="ID_273407473" MODIFIED="1515298730297" TEXT="k&#xf6;nnte gef&#xe4;hrlich sein">
+<icon BUILTIN="bell"/>
+<node CREATED="1515298735548" ID="ID_966210103" MODIFIED="1515298746799" TEXT="Stichwort: Sequence Points"/>
+<node CREATED="1515298747531" ID="ID_1013710090" MODIFIED="1515298752254" TEXT="im Debugger beobachtet"/>
+<node CREATED="1515298753074" ID="ID_5305718" MODIFIED="1515298776867" TEXT="Builder-Syntax scheint zu funktionieren, wie erwartet"/>
+<node CREATED="1515298777551" ID="ID_1384914895" MODIFIED="1515298789593" TEXT="explizite Aufruf-Syntax ebenso"/>
+</node>
 </node>
 </node>
 </node>