I am currently trying to run the F# CTP (1.9.6.2) on Mono 2.2 on OS X 10.5.6 (Leopard), and I have observed very unusual behavior. Specifically, when FSI loads up, I can enter a statement and it works just fine. However, if I enter second statement, FSI fails with the following (terminal) error:

error FS0193: internal error: Object does not match target type.

Please build a small example that reproduces this problem and report it to fsbugs@microsoft.com.

Unhandled Exception: Microsoft.FSharp.Compiler.Ast+StopProcessingException: Exception of type 'Microsoft.FSharp.Compiler.Ast+StopProcessingException' was thrown.

at Microsoft.FSharp.Compiler.Interactive.Shell.reportError[Object] (System.Exception err) [0x00000]

at Microsoft.FSharp.Compiler.Interactive.Shell+clo@370.Invoke (System.Exception err@354_1) [0x00000]

at Microsoft.FSharp.Compiler.Ast.errorR (System.Exception exn) [0x00000]

at Microsoft.FSharp.Compiler.Ast.errorRecovery (System.Exception exn, Int64 m) [0x00000]

at Microsoft.FSharp.Compiler.Interactive.Shell.stopProcessingRecoveryMulti (System.Exception e) [0x00000]

Interestingly, this happens no matter what the second statement says. This behavior is repeatable on both my Mac Pro and my Mac Book (which have the same versions I listed at the top of the email, but have them installed in different locations). I am going to report this to the above mentioned email, but I wanted to see if anyone had run into this before and/or knew of a fix. Or am I just doing something wrong with FSI?