It is not possible to use a function before it's defined, except in the limited case of 'let rec ... and ...' and methods in 'type ... and ...'.
(Also interfaces: e.g. define IFoo, write code using IFoo, later create classes that implement IFoo.)
.fsi files are just for summarizing the contents of an implementation file as well as selectively hiding/exposing some members to the subsequent files in the project.
OK, thx. Pity though, it would be neat to write programs top-down by declaring all funtions (C++ style, also possible in Haskell) and then defining the main functions first and the subordinate stuff later in the file.
Writing bottom-up takes a little getting used to.
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Is it possible to use a function that is declared (with a type signature in a .fsi file), but not yet defined?
I thought this was what .fsi files with type signatures was for, but I can't get it to work.