[racket] Type info lost for required function used in Racket REPL... but DrRacket REPL is OK?

From: Greg Hendershott (greghendershott at gmail.com)
Date: Fri Apr 25 09:24:02 EDT 2014

Great!

1. I pushed this for racket-mode.
   https://github.com/greghendershott/racket-mode/commit/c782dbb23eced63d51cf58b4c3d9f80afb0206ff

2. I submitted a PR to change `enter!`.
   https://github.com/plt/racket/pull/626

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