Andre van Tonder scripsit:

> At the toplevel, can we
>
>   1) shadow an imported binding with a new definition or syntax
>   definition?  2) shadow an imported binding with a new import?

These shadowings are allowed at the REPL but not within a module.  The
draft does not yet specify what happens in a top-level script.  My view
is that top-level scripts should run in the REPL.

It's also my view that redefinition of a syntax keyword does not affect
existing procedure definitions that make use of it.  This is what
happens in all extant R5RS Schemes except SCM.

--
A mosquito cried out in his pain,               John Cowan
"A chemist has poisoned my brain!"              http://www.ccil.org/~cowan
        The cause of his sorrow                 cowan@ccil.org
        Was para-dichloro-
Diphenyltrichloroethane.                                (aka DDT)

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