Fix Susan array traversal with unused mapped items (#14415)

---------

Co-authored-by: anotheruserofgithub <96748782+anotheruserofgithub@users.noreply.github.com>

Author: adrpo

OMCompiler/Compiler/Template/TplAbsyn.mo

@@ -2759,10 +2759,15 @@ algorithm
         (mapstmts, maplocals)
           = addGetIndex(isUsed, freshIdxName, mapstmts, imlicitTxt, maplocals);
 
-        //assume the array element is the first identifier in case locals
+        //define identifiers for array traversal
         idxName = "i";
         arrName = "items";
-        (eltName, _) :: _ = caseLocals;
+        eltName = match mexp
+          case BIND_MATCH(eltName)
+            then eltName;
+          case REST_MATCH()
+            then "";
+        end match;
 
         mapctx = MAP_CONTEXT(ofbind, mapexp, iopts, hasIndexIdentOpt, useiter);
 

OMCompiler/Compiler/boot/CMakeLists.txt

@@ -8,7 +8,7 @@ else()
 #download and unpack the sources
 file(MAKE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/bomc/)
 # the OMBOOTSTRAPPING_GIT_HASH needs updating when the boostrapping sources change
-SET(OMBOOTSTRAPPING_GIT_HASH f707623a9b9eed5d67e940e4859e9d92c7eb22f9)
+SET(OMBOOTSTRAPPING_GIT_HASH f53f31420ab8a1877b1a423693599028df698e14)
 file(DOWNLOAD https://github.com/OpenModelica/OMBootstrapping/archive/${OMBOOTSTRAPPING_GIT_HASH}.tar.gz
      ${CMAKE_CURRENT_SOURCE_DIR}/bomc/sources.tar.gz
      SHOW_PROGRESS

OMCompiler/Compiler/susan_codegen/TplCodegen.tpl

@@ -135,7 +135,9 @@ try
 >>
 %>
   for <%idxName%> in 1:arrayLength(<%arrName%>) loop
+    <%if eltName then <<
     <%eltName%> := arrayGet(<%arrName%>, <%idxName%>);
+    >>%>
     <%statements |> it => '<%mmExp(it, ":=")%>;' ;separator="\n"%>
   end for;<% if debugSusan() then
 <<