§7.1.3 defines the syntax of parameterize. The correct syntax is "(<expression> <expression>)". §4.2.6 defines the semantics of parametrize. It requires that the first expression evaluate to a parameter object.

Furthermore, restricting the first expression to an identifier would not eliminate type errors. Consider:

(define foo 1)
(parameterize ((foo 2)) ...)

Regards,

Alan

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