true : bin_annot, safe_string

<_b0> : -traverse
<src> : include
<src/react_top.*> : package(compiler-libs.toplevel)

<test> : include
<test/clock.{native,byte}> : use_unix
<test/breakout.{native,byte}> : use_unix
<test/js_*.*> : package(js_of_ocaml), package(js_of_ocaml-ppx)