fix- 23401 Base class constructor not called

compiler/src/dmd/semantic3.d

@@ -1556,6 +1556,7 @@ private extern(C++) final class Semantic3Visitor : Visitor
              */
             Identifier id = Identifier.generateId("__o");
             auto ts = new ThrowStatement(ctor.loc, new IdentifierExp(ctor.loc, id));
+            ts.internalThrow = true; // just rethrows the caught exception
             auto handler = new CompoundStatement(ctor.loc, ss, ts);
 
             auto ctch = new Catch(ctor.loc, getException(), id, handler);

compiler/src/dmd/statementsem.d

@@ -3644,7 +3644,9 @@ Statement statementSemanticVisit(Statement s, Scope* sc)
         //printf("ThrowStatement::semantic()\n");
         if (throwSemantic(ts.loc, ts.exp, sc))
         {
-            sc.ctorflow.orCSX(CSX.halt);
+            // internal rethrows shouldn't halt ctor flow
+            if (!ts.internalThrow)
+                sc.ctorflow.orCSX(CSX.halt);
             result = ts;
         }
         else

compiler/test/runnable/test23401.d

@@ -0,0 +1,11 @@
+// https://github.com/dlang/dmd/issues/23401
+
+struct HasDtor { int x; ~this() {} }
+class Base    { int marker; this() { marker = 42; } }
+class Derived : Base { HasDtor field; this() {} }
+
+void main()
+{
+    auto d = new Derived();
+    assert(d.marker == 42);
+}