Hi all - I am running into issues composing a couple of syntax-case macros, and not sure where things go wrong. When I try to write a `cond-it` using an working `if-it` and `when-it`, I was unable to capture `it` within `cond-it`.  <div style="margin-left: 40px;">;; the working if-it & when-it (define-syntax (if-it stx)   (syntax-case stx ()     ((if-it test? then else)      (with-syntax ((it (datum->syntax #'if-it 'it)))        #'(let ((it test?))            (if it then else)))))) (define-syntax (when-it stx)   (syntax-case stx ()     ((~ test? exp exp2 ...)      (with-syntax ((it (datum->syntax #'~ 'it)))        #'(let ((it test?)) (when it exp exp2 ...)))))) ;; the non-working cond-it (define-syntax (cond-it stx)   (syntax-case stx (else)     ((cond-it (else exp exp2 ...))      #'(begin exp exp2 ...))     ((cond-it (test? exp exp2 ...))      #'(when-it test? exp exp2 ...))     ((cond-it (test? exp exp2 ...) cond1 cond2 ...)      #'(if-it test? (begin exp exp2 ...)               (cond-it cond1 cond2 ...))))) </div> I tried to capture the `it` binding as well - but it still doesn't work. <div style="margin-left: 40px; font-family: courier new,monospace;"> (define-syntax (cond-it stx)   (syntax-case stx (else)     ((cond-it (else exp exp2 ...))      #'(begin exp exp2 ...))     ((cond-it (test? exp exp2 ...))      (with-syntax ((it (datum->syntax #'cond-it 'it)))        #'(when-it test? exp exp2 ...)))     ((cond-it (test? exp exp2 ...) cond1 cond2 ...)      (with-syntax ((it (datum->syntax #'cond-it 'it)))        #'(if-it test? (begin exp exp2 ...)                 (cond-it cond1 cond2 ...)))))) </div> When I finally write `cond-it` without using `if-it` and `when-it`, it worked. <div style="margin-left: 40px; font-family: courier new,monospace;">(define-syntax (cond-it stx)   (syntax-case stx (else)     ((cond-it (else exp exp2 ...))      #'(begin exp exp2 ...))     ((cond-it (test? exp exp2 ...))      (with-syntax ((it (datum->syntax #'cond-it 'it)))        #'(let ((it test?)) (when it exp exp2 ...))))     ((cond-it (test? exp exp2 ...) cond cond2 ...)      (with-syntax ((it (datum->syntax #'cond-it 'it)))        #'(let ((it test?))            (if it (begin exp exp2 ...)                (cond-it cond cond2 ...))))))) </div> What am I missing here?  How can `cond-it` be composed of `if-it` and `when-it`? Any tips are appreciated.  Thanks, yc