What's `v(-1)` in place of the omitted left side expression in an operator overload

[al2o3cr]

@DaAnalyst

So, what is the v(-1) and is it dependable (i.e. may I expect always to get it when omitting the left side expression for an operator mandating it?

This is a behavior of the IEx read-eval-print loop to support multiline expressions, it won’t happen anywhere else. The v function here is IEx.Helpers.v/1.