Syntax error: cannot evaluate compiler-special-form

        (##core#define-foreign-variable code_75 unsigned-long "C_HEADER_SIZE_MASK")

        Expansion history:

        <syntax>          (##core#begin (define-constant maximal-vector-size (foreign-value "C_HEADER_SIZE_MASK" unsigned-long......
        <syntax>          (define-constant maximal-vector-size (foreign-value "C_HEADER_SIZE_MASK" unsigned-long))
        <syntax>          (##core#define-constant maximal-vector-size (foreign-value "C_HEADER_SIZE_MASK" unsigned-long))
        <syntax>          (##core#let ((maximal-string-length (quote 16777215)) (default-parameter-vector-size (quote 16)) (re......
        <syntax>          (##core#begin (##core#define-foreign-variable code_75 unsigned-long "C_HEADER_SIZE_MASK") (##core#th......
        <syntax>          (##core#define-foreign-variable code_75 unsigned-long "C_HEADER_SIZE_MASK")   <--
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