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Asked: 2026-06-17T17:39:18+00:00

As far as I know in Simple ML, tuples are being accessed via #n

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As far as I know in Simple ML, tuples are being accessed via #ns and previously I have seen it working but now it does not work!

I have tried this following line:

val a =#2 ("one", "2", "three")

But it is giving me the following error back:

first.sml:25.26 Error: syntax error found at EOF

uncaught exception Compile [Compile: "syntax error"]
  raised at: ../compiler/Parse/main/smlfile.sml:15.24-15.46
             ../compiler/TopLevel/interact/evalloop.sml:44.55
             ../compiler/TopLevel/interact/evalloop.sml:296.17-296.20
-

Weird!

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1 Answer

  1. Editorial Team

    Standard ML allows you to define your own arbitrary operators. This means that when you mix infix and prefix operators, you need to have spaces between them – otherwise they’d be interpreted as one operator.

    In other words, SML thinks you’re trying to call the non-existent =# operator in your code. If you add a space between the = and the #, it will work fine.

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