xo-expression2 xo-gc: DSequenceExpr builds [WIP]

src/expression2/CMakeLists.txt

@@ -10,6 +10,7 @@ set(SELF_SRCS
     DLambdaExpr.cpp
     DApplyExpr.cpp
     DIfElseExpr.cpp
+    DSequenceExpr.cpp
 
     TypeRef.cpp
 
@@ -34,6 +35,8 @@ set(SELF_SRCS
     IExpression_DIfElseExpr.cpp
     IPrintable_DIfElseExpr.cpp
 
+    IExpression_DSequenceExpr.cpp
+
     DLocalSymtab.cpp
     DGlobalSymtab.cpp