# Introduction to Reason Compilation

[CG]Nick
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OCaml's compiler has a nice, flexible pre-processing step described in run.sh. A Reason file is just an ordinary OCaml file that leverages that feature. Therefore, everything that semantically works in OCaml should, in theory, work in Reason, and vice-versa.
We start with a shell file, run.sh, which, upon execution, compiles & runs the output.