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But \starttext \startMPcode label("\m{\root3\of2}", origin); \stopMPcode \stoptext doesn't. Running `LuaMetaTeX' on `trial' with ``/home/fvleung/ConTeXt/tex/texmf-linux-64/bin/mtxrun --autogenerate --script context trial.tex'' resolvers | formats | executing runner 'run luametatex format': /home/fvleung/ConTeXt/tex/texmf-linux-64/bin/luametatex --jobname="trial" --fmt=/home/fvleung/ConTeXt/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.fmt --lua=/home/fvleung/ConTeXt/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.lui cont-yes.mkiv --c:currentrun=1 --c:fulljobname="./trial.tex" --c:input="./trial.tex" --c:kindofrun=1 --c:maxnofruns=9 --c:texmfbinpath="/home/fvleung/ConTeXt/tex/texmf-linux-64/bin" open source > level 1, order 1, name 'cont-yes.mkiv' fonts > beware: no fonts are loaded yet, using 'lm mono' in box system > system > ConTeXt ver: 2021.07.27 19:27 LMTX fmt: 2021.7.28 int: english/english system > system > 'cont-new.mkxl' loaded open source > level 2, order 2, name '/home/fvleung/ConTeXt/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl' system > beware: some patches loaded from cont-new.mkiv close source > level 2, order 2, name '/home/fvleung/ConTeXt/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl' system > files > jobname './trial', input './trial.tex', result './trial' fonts > latin modern fonts are not preloaded languages > language 'en' is active open source > level 2, order 3, name './trial.tex' fonts > preloading latin modern fonts (second stage) fonts > 'fallback modern-designsize rm 12pt' is loaded metapost > initializing instance 'metafun:1' using format 'metafun' and method 'default' metapost > loading 'metafun' as 'metafun.mpxl' using method 'default' metapost > initializing number mode 'scaled' metapost > trace > This is MPLIB for LuaMetaTeX, version 3.11, running in scaled mode. metapost > trace > metapost > trace > loading metafun for lmtx, including the plain 1.004 base definitions metapost > trace > tex error > tex error on line 7 in file ./trial.tex: Argument of \root has an extra } 32\normalstopimath \fi \par } } \global \setbox \mptextbox \hbox {\clf_mptexttoks } [[special cmd: end local call]] \relax ... \stopMPcode 1 \starttext 2 3 \startMPcode 4 label("\m{\root3\of2}", origin); 5 \stopMPcode 6 7 >> \stoptext 8 I've run across a '}' that doesn't seem to match anything. For example, '\def\a#1{...}' and '\a}' would produce this error. The '\par' that I've just inserted will cause me to report a runaway argument that might be the root of the problem. mtx-context | fatal error: return code: 256 TeX Output exited abnormally with code 1 at Fri Sep 3 17:44:19 --00000000000040b88205cb143387 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
\starttext

\m{\root3\of2}

\stoptext
=
works.=C2=A0

But

\starttext

\startMPcode
=C2=A0 label("\m{\root3\of2}&= quot;, origin);
\stopMPcode

\stoptext

doesn't.

Running `LuaMetaTeX' on `trial&= #39; with ``/home/fvleung/ConTeXt/tex/texmf-linux-64/bin/mtxrun --autogener= ate --script context trial.tex''

resolvers =C2=A0 =C2=A0 =C2= =A0 | formats | executing runner 'run luametatex format': /home/fvl= eung/ConTeXt/tex/texmf-linux-64/bin/luametatex --jobname=3D"trial"= ; --fmt=3D/home/fvleung/ConTeXt/tex/texmf-cache/luatex-cache/context/5fe67e= 0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.fmt --lua=3D/home/fvl= eung/ConTeXt/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1= 556f32e/formats/luametatex/cont-en.lui cont-yes.mkiv --c:currentrun=3D1 --c= :fulljobname=3D"./trial.tex" --c:input=3D"./trial.tex" = --c:kindofrun=3D1 --c:maxnofruns=3D9 --c:texmfbinpath=3D"/home/fvleung= /ConTeXt/tex/texmf-linux-64/bin"
open source =C2=A0 =C2=A0 > lev= el 1, order 1, name 'cont-yes.mkiv'
fonts =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 > beware: no fonts are loaded yet, using 'lm mono'= in box
system =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
system =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0> ConTeXt =C2=A0ver: 2021.07.27 19:27 LMTX = =C2=A0fmt: 2021.7.28 =C2=A0int: english/english
system =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0>
system =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> = 9;cont-new.mkxl' loaded
open source =C2=A0 =C2=A0 > level 2, orde= r 2, name '/home/fvleung/ConTeXt/tex/texmf-context/tex/context/base/mkx= l/cont-new.mkxl'
system =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> bewar= e: some patches loaded from cont-new.mkiv
close source =C2=A0 =C2=A0>= level 2, order 2, name '/home/fvleung/ConTeXt/tex/texmf-context/tex/co= ntext/base/mkxl/cont-new.mkxl'
system =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0> files > jobname './trial', input './trial.tex'= ;, result './trial'
fonts =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >= ; latin modern fonts are not preloaded
languages =C2=A0 =C2=A0 =C2=A0 &g= t; language 'en' is active
open source =C2=A0 =C2=A0 > level = 2, order 3, name './trial.tex'
fonts =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 > preloading latin modern fonts (second stage)
fonts =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 > 'fallback modern-designsize rm 12pt= 9; is loaded
metapost =C2=A0 =C2=A0 =C2=A0 =C2=A0> initializing insta= nce 'metafun:1' using format 'metafun' and method 'defa= ult'
metapost =C2=A0 =C2=A0 =C2=A0 =C2=A0> loading 'metafun&#= 39; as 'metafun.mpxl' using method 'default'
metapost = =C2=A0 =C2=A0 =C2=A0 =C2=A0> initializing number mode 'scaled'metapost =C2=A0 =C2=A0 =C2=A0 =C2=A0> trace > This is MPLIB for Lua= MetaTeX, version 3.11, running in scaled mode.
metapost =C2=A0 =C2=A0 = =C2=A0 =C2=A0> trace >
metapost =C2=A0 =C2=A0 =C2=A0 =C2=A0> t= race > loading metafun for lmtx, including the plain 1.004 base definiti= ons
metapost =C2=A0 =C2=A0 =C2=A0 =C2=A0> trace >
tex error = =C2=A0 =C2=A0 =C2=A0 > tex error on line 7 in file ./trial.tex: Argument= of \root has an extra }

32\normalstopimath \fi

<inserted= text>
=C2=A0 =C2=A0 \par
<to be read again>
=C2=A0 = =C2=A0 }
<lua output> }
=C2=A0 =C2=A0

<local> \gl= obal \setbox \mptextbox \hbox {\clf_mptexttoks
=C2=A0 =C2=A0 }

&= lt;inserted text>
=C2=A0 =C2=A0 [[special cmd: end local call]]
<= br><to be read again>
=C2=A0 =C2=A0 \relax
...


<= ;line 4.5> \stopMPcode
=C2=A0 =C2=A0
1 =C2=A0 =C2=A0 \starttext2 =C2=A0 =C2=A0
3 =C2=A0 =C2=A0 \startMPcode
4 =C2=A0 =C2=A0 =C2= =A0 label("\m{\root3\of2}", origin);
5 =C2=A0 =C2=A0 \stopMPco= de
6 =C2=A0 =C2=A0
7 >> =C2=A0\stoptext
8 =C2=A0 =C2=A0 I've run across a '}' that doesn't seem to match anything.= For example,
'\def\a#1{...}' and '\a}' would produce th= is error. The '\par' that I've just
inserted will cause me t= o report a runaway argument that might be the root of the
problem.
mt= x-context =C2=A0 =C2=A0 | fatal error: return code: 256

TeX Output e= xited abnormally with code 1 at Fri Sep =C2=A03 17:44:19
--00000000000040b88205cb143387-- --===============3948144811684682253== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KSWYgeW91ciBxdWVzdGlvbiBpcyBvZiBpbnRlcmVz dCB0byBvdGhlcnMgYXMgd2VsbCwgcGxlYXNlIGFkZCBhbiBlbnRyeSB0byB0aGUgV2lraSEKCm1h aWxsaXN0IDogbnRnLWNvbnRleHRAbnRnLm5sIC8gaHR0cDovL3d3dy5udGcubmwvbWFpbG1hbi9s aXN0aW5mby9udGctY29udGV4dAp3ZWJwYWdlICA6IGh0dHA6Ly93d3cucHJhZ21hLWFkZS5ubCAv IGh0dHA6Ly9jb250ZXh0LmFhbmhldC5uZXQKYXJjaGl2ZSAgOiBodHRwczovL2JpdGJ1Y2tldC5v cmcvcGhnL2NvbnRleHQtbWlycm9yL2NvbW1pdHMvCndpa2kgICAgIDogaHR0cDovL2NvbnRleHRn YXJkZW4ubmV0Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCg== --===============3948144811684682253==--