Strange Fsi.exe behavior

Strange Fsi.exe behavior

I'm observing some strange behavior when using the F# interactive interpreter.

Running the following code:

let getType1 = Type.GetType("namespace.does.not.exist, doesntexistlib, Version=, Culture=neutral, PublicKeyToken=null",false);; let getType2 = Type.GetType("namespace.does.not.exist, doesntexistlib, Version=, Culture=neutral, PublicKeyToken=null",false);; 

results in fsi catching a FileLoadException even though the throwOnError parameter is set to false. The first time it returns a null second time the exception occurs.

Running the same code in a regular program (not interactively) results in expected behavior where getType = null.

Does FSI.exe stop on all exceptions? Is it possible to set FSI to ignore these exceptions?

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Based on the stack trace, it looks like FSI is hooking into its AppDomain's assembly resolution.

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Unfortunately FSI is throwing the exception itself when it can't resolve the assembly - this isn't being generated by framework code, and that's why your throwOnError parameter isn't being respected - FSI's exception is just propagating upwards and then being caught at the top level.

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To me, this looks like a bug in FSI, but it may be that the available hooks in the AppDomain's assembly resolution process don't provide FSI with enough information to determine when it's okay to throw..
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EDIT - If you look into the source file fsi.fs (included in the F# distribution in the source/fsharp/Fsi directory), you can see where this handler is hooked up (it's in the frighteningly named MagicAssemblyResolution module).

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It appears that FSI needs to hook into the resolution process so that assemblies registered via the #r directive can be found, but I can't tell at a glance where things are going wrong, or why no exception is thrown all the way to the top level the first time you try to resolve an invalid assembly..
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