This is erroring when run in Visual Studio F# Interactive window, but not in the command line F# REPL or in Rider.
let numbers = [1..10]
let numberFilter number = number % 5 = 0 || number % 3 = 0
;;
error FS0193: internal error: Index not found. (Exception from HRESULT: 0x80131124)
The answer was that Visual Studio had got it's knickers in a twist.
Right click and reset on the F# window cured the problem. Still don't know what caused it though.
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