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> Now consider > (cond-expand > ((and srfi-4 srfi-10 srfi-10-4) > (define sample-vector '#,(f32 1.0 2.0 3.0)))) Note that mixing "cond-expand" and "#,(...)" as in this example is not a good practice. That is because "#," operates at read-time and cond-expand operates later, at macro-expansion time. So the constructor for f32 will be executed regardless of the presence of srfi-4, srfi-10, and srfi-10-4 (and if "#," is not supported by the reader, you will get a reader error). The "#," mechanism requires the user to understand yet another level of compilation and the time when it is performed (and the model is already not that simple if you consider forms like "(load ...)", "(include ...)", and "(eval ...)", and the REPL). Marc