[NF] Add more when tests.

Belonging to [master]:
  - OpenModelica/OMCompiler#3012
  - #1152

Author: perost

flattening/modelica/scodeinst/Makefile

@@ -825,6 +825,7 @@ WhenClocked1.mo \
 WhenClockedElse1.mo \
 WhenClockedElse2.mo \
 WhenClockedStatement1.mo \
+WhenClockedTupleCall1.mo \
 WhenIllegalContext1.mo \
 WhenIllegalContext2.mo \
 WhenIllegalContext3.mo \

flattening/modelica/scodeinst/WhenClockedTupleCall1.mo

@@ -0,0 +1,29 @@
+// name: WhenClockedTupleCall1
+// keywords:
+// status: correct
+// cflags: -d=newInst
+//
+
+function f
+  output Real x = 1;
+  output Real y = 2;
+end f;
+
+model WhenClockedTupleCall1
+  Real x, y;
+equation
+  when Clock() then
+    (x, y) = f();
+  end when;
+end WhenClockedTupleCall1;
+
+// Result:
+// class WhenClockedTupleCall1
+//   Real x;
+//   Real y;
+// equation
+//   when Clock() then
+//     (x, y) = (1.0, 2.0);
+//   end when;
+// end WhenClockedTupleCall1;
+// endResult