• Version: 10.0.0 nightly 2018 01 14–16
• Platform: Windows 7 x64, cmd.exe shell
• Subsystem: repl

Steps to reproduce:

1. download a Windows nightly from 2018 01 14 up to 2018 01 16.
2. Start REPL session.
3. Evaluate some last commands from the history with UP+ENTER keys.

Anomalies:

1. Strange prompt symbols / output wrappings (ANSI escape codes?).
2. These symbols are preserved and added with each UP key press.
3. The output is decolorized.

Not sure if this is reproducible in other OSs.