Problems when trying to run FParsec in F# Interactive

Question

I'm trying to run some FParsec code in F# Interactive but with no success. I am able to build and run this tutorial.fs file, but the same isn't happening with FSI, as it didn't recognize FParsec.dll.

I've already tried running the #r "Parsec" command in FSI but it was of no avail.

Anyone has a clue on what might be the problem here?

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score 15 · Accepted Answer · answered Aug 22 '11 at 03:15

15

FParsec is not GAC installed, therefore you need to put the full path to the dll in the #r directive, not just the name of the assembly. Also, don't forget that "...FParsec is built as two DLLs. The C# bits are compiled into the FParsecCS.dll and the F# bits (which depend on the C# bits) are compiled into FParsec.dll." (section 3.2 of the documentation). e.g.

#r @"C:\FParsecCS.dll"
#r @"C:\FParsec.dll"

answered Aug 22 '11 at 03:15

Stephen Swensen

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I was *sure* I had tried it with the full path, too. Seems I was mistaken. – devoured elysium Aug 22 '11 at 03:35
If you are always using the dll you can add it to FSI automatically via the command line with `-r "C:\Fparsec.dll"`. The option is hiding in the FSI options in visual studio – John Palmer Aug 22 '11 at 05:26
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Also, be sure you reference FParsecCS before FParsec, otherwise you'll get an error FS0074. – leakyboat Oct 14 '11 at 19:29
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Reset the Interactive after every script change. – citykid Jan 12 '14 at 12:30
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In visual studio, to reset the interactive F# window, right-click anywhere in the F# interactive window -> "Reset Interactive Session" – theoski Oct 14 '15 at 20:31

Problems when trying to run FParsec in F# Interactive

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