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Created attachment 15532 [details]
Exception stack trace
In the csharp repl for mono 126.96.36.199/f8474c4 there is an uncaught indexoutofrange exception when using new code completion system.
To replicate this bug, open the repl and type "Int32.", then scroll down to "TryParse", back up to "ToString", and then down to "TryParse" again. The second time you select TryParse, the exception will be thrown, crashing the session.
The same issue occurs with "Int64" and "Double", where you scroll to the end of the completion list, up one entry, and then back down.
I have attached a dump of the exception message.
I cannot reproduce the issue with recent Mono version (5.8)