Fix row_polymorphism.topscript
Fix row_polymorphism.topscript

Add a definition for the `shape` type.

nasrallahmounir/examples,realworldocaml/examples,nasrallahmounir/examples,devsmt/realworldocaml_examples,realworldocaml/examples,devsmt/realworldocaml_examples,nasrallahmounir/examples,devsmt/realworldocaml_examples,nasrallahmounir/examples,realworldocaml/examples,realworldocaml/examples,nasrallahmounir/examples,devsmt/realworldocaml_examples