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Editorial Team
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Asked: 2026-05-18T03:58:06+00:00

Kinda self explanatory… I get a variety of errors when try to access 4.0

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Kinda self explanatory…

I get a variety of errors when try to access 4.0 dlls in FSI. So rather than go through each one, I think the above question is the right one.

This is a repost more or less of my question here in F# on MAC OSX and Ubuntu I get an error running FSI in 4.0

Thanks

Gary

Edit I am trying to run the following in a demo on my MacBook with Mono 2.8 and fsharp. (The code was chosen by someone else)

open System.Numerics
open System

let maxIteration = 100

let modSquared (c : Complex) = c.Real * c.Real + c.Imaginary * c.Imaginary

type MandelbrotResult = 
    | DidNotEscape
    | Escaped of int

let mandelbrot c =
    let rec mandelbrotInner z iterations =
        if(modSquared z >= 4.0) 
            then Escaped iterations
        elif iterations = maxIteration
            then DidNotEscape
        else mandelbrotInner ((z * z) + c) (iterations + 1)
    mandelbrotInner c 0

for y in [-1.0..0.1..1.0] do
    for x in [-2.0..0.05..1.0] do
        match mandelbrot (Complex(x, y)) with
        | DidNotEscape -> Console.Write "#"
        | Escaped _ -> Console.Write " "
    Console.WriteLine ()
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1 Answer

  1. Editorial Team

    I downloaded the ZIP binaries and tried to run the 4.0 version on MacOS. Initially, I get the same error as you (could not locate BigInteger). This can be fixed by adding the -I command line argument, but then I got another error and I’m not yet sure what to do about this one:

    fsmac:fsharp4 tomas$ mono Fsi.exe 
  -I:/Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/4.0/

Microsoft (R) F# 2.0 Interactive build 4.0.30319.1
Copyright (c) Microsoft Corporation. All Rights Reserved.

For help type #help;;

> 
error FS0192: internal error: unreachable: GetGlobals

    EDIT Here is another (unsuccessful) attempt. This looks like a Mono bug, because the UnsafeLoadFrom method doesn’t seem to exist on Mono (runtime 4.0). At least, I cannot see it in the MonoDevelop IDE in C# projects (when I change runtime to 4.0)

    fsmac:fsharp4 tomas$ mono --runtime=v4.0.30319 Fsi.exe --noframework 
  -r:/Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/4.0/mscorlib.dll 
  -r:FSharp.Core.dll 

Microsoft (R) F# 2.0 Interactive build 4.0.30319.1
Copyright (c) Microsoft Corporation. All Rights Reserved.

For help type #help;;

> Missing method System.Reflection.Assembly::UnsafeLoadFrom(string) in 
assembly /Library/Frameworks/Mono.framework/Versions/2.8/lib/mono/4.0/
mscorlib.dll, referenced in assembly /Users/tomas/Programs/fsharp4/
FSharp.Compiler.dll
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