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[1.9.9.9] How to use multiple files when use fsc ?
f#

Hello,

I have two files

// Program.fs

#light

module MyCompany.MyNamespace.MyModule2

open MyCompany.MyNamespace.MyModule1

let b = 42

//file2.fs

#light

module MyCompany.MyNamespace.MyModule1

let a = 42

when I try to compile that files with fsc, I have:

>"E:\Program Files\FSharp-1.9.9.9\\bin\fsc.exe" -o:obj\Debug\demo.exe Program.fs File2.fs

Microsoft (R) F# 2.0 Compiler build 1.9.9.9

Copyright (c) Microsoft Corporation. All Rights Reserved.

Program.fs(4,6): error FS0039: The namespace or module 'MyCompany' is not defined

What is the cause of that error ?

Thank you

.

I've just found the answer - it is because the order of files in command line.

Such fsc's call is succeeded:

J:\_Projecting\F#\demo>"E:\Program Files\FSharp-1.9.9.9\\bin\fsc.exe" -o:obj\Debug\demo.exe File2.fs Program.fs

Is it minor "bug", that will be fix in future F# releases ? :)

By on 4/4/2010 12:25 PM ()

I was looking for a reference to point you at but I can't seem to find it anywhere--my google fu is failing me. At any rate, this is not a bug; F# code is order dependent. You have to declare symbols before they're used.

See this excellent explanation from one of the architects of F# about why this is a good thing:

[link:cs.hubfs.net]

I've read his reasoning and while at first it seemed annoying personally I find hidden dependencies even more annoying and hard to resolve so I'm glad they've made this design decision.

By on 4/8/2010 5:21 AM ()

Hi Didro,
In your solution explorer are they in proper order, i.e. the referenced file Module1 is above Module2? As compiler takes solution explorer "order" into account, we have the option to move-up and move-down the order of the files by right click.

By on 4/7/2010 11:37 PM ()

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