Does setting the "current-namespace" parameter fix it for you?
#lang scheme/base
(define my-namespace (make-base-namespace))
(define (tree->proc tree symbol)
(parameterize ((current-namespace my-namespace))
(eval `(lambda (,symbol) ,tree))))
((tree->proc '(+ x (* 3 (* x x))) 'x) 42)
;; ==> 5334
Also, a comma was missing in the original example.
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