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Editorial Team
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Asked: 2026-06-17T20:25:35+00:00

Recently I have started dabbling in the sml-mode Emacs package for running SML code.

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Recently I have started dabbling in the sml-mode Emacs package for running SML code. The problem I’m facing is when I try to send across a region of my SML code/file to the REPL (which I think is the only logical way of writing multi-line functions in SML without getting troubled by the primitive REPL). Here is my workflow:

  • Open up an SML file (the SML mode shows in the bottom part of the window)
  • Open up the REPL if it isn’t already running (C-c C-s)
  • Again get back to the SML file and write a function
  • Select the entire function and then press C-C C-r. I get an error “Not a `sml-prog-proc` buffer”
  • Now instead of selecting a region, just try to send the entire file to the REPL using C-C C-l; again the same error in the mini-buffer

Can someone please help me out in understand why this occurs and how to actually send across code from a script/file to the REPL when using SML? If it matters, I’m using SML/NJ.

TIA,
sasuke

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1 Answer

  1. Editorial Team

    This was bugging me as well, as it worked on some occasions but not on others.

    If the sml process is killed with C-d (as recommended when issuing ‘use’ commands) and immediately restarted from the same buffer (C-c C-s), the error will occur whenever any of the ‘send-to-repl’ operations are performed.

    The correct way (after killing the repl) is to switch back to the buffer containing the .sml file that is being edited and restart the repl from there (C-c C-s) or by either of (C-c C-r) or (C-c C-l).

    HTH.

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