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[Joris van der Hoeven <address@hidden>]

On Mon, 7 Jun 2004, Álvaro Tejero Cantero wrote:
> I want to redefine \rsup (superscript) in the context of a macro of my
> own, called \tensor. This is in order to make superscripts generate a
> \phantom equivalent space as a subscript automatically. The intent is to
> have an "ordered index list" for tensors.
>
> How does one redefine an existing macro within the context of a user
> macro?

Use the "with" primitive documented in

        Help -> Manual -> Reference guide for the TeXmacs primitives