bug#55619: [PATCH] gnu: smlnj: Fix use of Ctrl-c in sml REPL.

[Tobias Geerinckx-Rice]

Hi!

Thanks for the patch and the perfect comment.

The only thing I tweaked was the commit message, to reflect the 
‘what’ rather than (just) the ‘why’:

   * gnu/packages/sml.scm (smlnj): Replace INVOKE with SYSTEM
   which has more favourable signal dispositions.

Tested on a Guix System that could reproduce the original bug & 
pushed as 62da327848311a75723f16642c20d2925919237e.

Kind regards,

T G-R

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