We have seen this before.  If _ is a valid characteristics a name then $V_ is an undefined macro.  You need to use $V._ to get concatenation.



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On Oct 25, 2018, 07:49, at 07:49, Andreas Bergsland  wrote:
>Hi
>I had problems when revisiting a csd that used to run on 5.10. It
>turned out the errors were due to underscores in some of the macros, so
>that this code
>
>#define TEST(V)
>#
>prints    "$V_"
>#
>
>instr       1
>$TEST(1)
>endin
>
>would print
>$error
>
>
>When the underscore was replaced by other signs, it behaved as
>expected, e.g.
>#define TEST(V)
>#
>prints    "$V-"
>#
>
>instr       1
>$TEST(1)
>endin
>
>would print
>1-
>
>as expected
>
>Best,
>Andreas
>
>--
>Andreas Bergsland
>
>Associate professor - førsteamanuensis
>Study Programme Leader - studieprogramleder
>Music Technology Programme - Musikkteknologiseksjonen
>Department of Music - Institutt for musikk
>Olavskvartalet
>NTNU (Norwegian University of Science and Technology)
>7491 Trondheim, NORWAY
>
>Visiting address/besøksadresse: Fjordgt.1 (3.etg.)
>e-mail: andreas.bergsland@ntnu.no
>Office phone (Skype for business):7359 0096
>Mobil: 4566 3316
>http://folk.ntnu.no/andbe
>https://www.vibra.no/
>https://www.ntnu.edu/artec
>
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