macroexpandmacroexpand is a built-in function in `
C source code'. (macroexpand FORM &optional ENVIRONMENT) Return result of expanding macros at top level of FORM. If FORM is not a macro call, it is returned unchanged. Otherwise, the macro is expanded and the expansion is considered in place of FORM. When a non-macro-call results, it is returned. The second optional arg ENVIRONMENT specifies an environment of macro definitions to shadow the loaded ones for use in file byte-compilation.