fixes #25803: add genCppConstructorExpr for full type-prefixed expression

tests/cpp/tcpp_default_ctor_assignment.h

@@ -0,0 +1,30 @@
+#ifndef TCPP_DEFAULT_CTOR_ASSIGNMENT_H
+#define TCPP_DEFAULT_CTOR_ASSIGNMENT_H
+
+struct AmbiguousAssign {
+  int x;
+  const char* y;
+
+  AmbiguousAssign(): x(0), y(nullptr) {}
+  AmbiguousAssign(int x, const char* y): x(x), y(y) {}
+
+  AmbiguousAssign& operator=(int v) {
+    x = v;
+    y = nullptr;
+    return *this;
+  }
+
+  AmbiguousAssign& operator=(const char* s) {
+    x = 0;
+    y = s;
+    return *this;
+  }
+
+  AmbiguousAssign& operator=(const AmbiguousAssign& other) {
+    x = other.x;
+    y = other.y;
+    return *this;
+  }
+};
+
+#endif

tests/cpp/tcpp_default_ctor_assignment.nim

@@ -0,0 +1,14 @@
+discard """
+  cmd: "nim cpp $file"
+"""
+
+type
+  AmbiguousAssign {.importcpp, header: "tcpp_default_ctor_assignment.h".} = object
+    x: cint
+    y: cstring
+
+proc main =
+  var xs = newSeq[AmbiguousAssign](3)
+  doAssert xs.len == 3
+
+main()