Github user som-snytt commented on the issue:
https://github.com/apache/spark/pull/17982
The contract was never well-defined.
`sbt` overrides `createInterpreter` and runs its `initialCommands` before
returning. So that runs before REPL finishes init in `loopPostInit`: no
`$intp`, power mode not entered, start code and `-i` not run yet.
I can't tell just by looking if that suits your needs here, but it's the
most ancient hook enshrined by sbt.
https://github.com/sbt/sbt/blob/0.13/compile/interface/src/main/scala/xsbt/ConsoleInterface.scala#L27
@adriaanm is taking executive action to modularize/make API for REPL reuse.
Possibly you're aware or he's only just started and is in stealth mode. That
will address the issue in future.
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