[NTG-context] Strange error at lxml-mms.lmt:749

[NTG-context] Strange error at lxml-mms.lmt:749

[Andres Conrado Montoya]

[-- Attachment #1.1: Type: text/plain, Size: 2040 bytes --]

I keep bumping into this error, I have no idea what may be causing it, in a
statistics book with lots of math:

registered function call [250]:
...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:749: attempt to
index a nil value (local 'a2')

I have checked everything. I have tried commenting out many things and the
weird part is that it fails in a simple math expression: \math{E_{i}j}.
Even a simple $y$ or \math{a+b} will trigger the error. However, this same
file Im working on has many formulas before that, those work fine. I
changed all the $...$ to \math{...} just in case, but with no success.

Already tried remaking, regenerating, updating the distribution.

Do you have any ideas to work this out? I don't know how to provide a MWE
for this because it's a very big project (statistics book).

I have tried 2 versions, the system-wide one, just upgraded:
mtx-context     | ConTeXt Process Management 1.06
mtx-context     | current version: 2024.02.22 18:31

And a less recent version, attached to the project:
mtx-context     | ConTeXt Process Management 1.05
mtx-context     | current version: 2024.02.14 13:38


Any help will be much appreciated.

-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

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archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: Strange error at lxml-mms.lmt:749

[Andres Conrado Montoya]

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A remark: A few lines above the error triggering point, I found a single
digit presented as math: \math{5}. Removing this and leaving the 5 in text
mode removes the error below it.
Could it be a bug in the distribution?

El dom, 25 feb 2024 a las 15:24, Andres Conrado Montoya (<
andresconrado@gmail.com>) escribió:

> I keep bumping into this error, I have no idea what may be causing it, in
> a statistics book with lots of math:
>
> registered function call [250]:
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:749: attempt to
> index a nil value (local 'a2')
>
> I have checked everything. I have tried commenting out many things and the
> weird part is that it fails in a simple math expression: \math{E_{i}j}.
> Even a simple $y$ or \math{a+b} will trigger the error. However, this same
> file Im working on has many formulas before that, those work fine. I
> changed all the $...$ to \math{...} just in case, but with no success.
>
> Already tried remaking, regenerating, updating the distribution.
>
> Do you have any ideas to work this out? I don't know how to provide a MWE
> for this because it's a very big project (statistics book).
>
> I have tried 2 versions, the system-wide one, just upgraded:
> mtx-context     | ConTeXt Process Management 1.06
> mtx-context     | current version: 2024.02.22 18:31
>
> And a less recent version, attached to the project:
> mtx-context     | ConTeXt Process Management 1.05
> mtx-context     | current version: 2024.02.14 13:38
>
>
> Any help will be much appreciated.
>
> --
> Andrés Conrado Montoya
> Andi Kú
> andresconrado@gmail.com
> http://sesentaycuatro.com
> http://messier87.com
> http://chiquitico.org
> ----------------------------------------
> Los fines no justifican los medios, porque la medida verdadera de nuestro
> carácter está dada por los medios que estamos dispuestos a utilizar, no por
> los fines que proclamamos.
> ----------------------------------------
>
> “You develop an instant global consciousness, a people orientation, an
> intense dissatisfaction with the state of the world, and a compulsion to do
> something about it. From out there on the moon, international politics look
> so petty. You want to grab a politician by the scruff of the neck and drag
> him a quarter of a million miles out and say, ‘Look at that, you son of a
> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>


-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: Strange error at lxml-mms.lmt:749

[Andres Conrado Montoya]

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Another remark: It seems this behavior is consistent: if I comment out the
last equation before the one I told you before, again the next formula
works fine,

El dom, 25 feb 2024 a las 15:38, Andres Conrado Montoya (<
andresconrado@gmail.com>) escribió:

> A remark: A few lines above the error triggering point, I found a single
> digit presented as math: \math{5}. Removing this and leaving the 5 in text
> mode removes the error below it.
> Could it be a bug in the distribution?
>
> El dom, 25 feb 2024 a las 15:24, Andres Conrado Montoya (<
> andresconrado@gmail.com>) escribió:
>
>> I keep bumping into this error, I have no idea what may be causing it, in
>> a statistics book with lots of math:
>>
>> registered function call [250]:
>> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:749: attempt to
>> index a nil value (local 'a2')
>>
>> I have checked everything. I have tried commenting out many things and
>> the weird part is that it fails in a simple math expression: \math{E_{i}j}.
>> Even a simple $y$ or \math{a+b} will trigger the error. However, this same
>> file Im working on has many formulas before that, those work fine. I
>> changed all the $...$ to \math{...} just in case, but with no success.
>>
>> Already tried remaking, regenerating, updating the distribution.
>>
>> Do you have any ideas to work this out? I don't know how to provide a MWE
>> for this because it's a very big project (statistics book).
>>
>> I have tried 2 versions, the system-wide one, just upgraded:
>> mtx-context     | ConTeXt Process Management 1.06
>> mtx-context     | current version: 2024.02.22 18:31
>>
>> And a less recent version, attached to the project:
>> mtx-context     | ConTeXt Process Management 1.05
>> mtx-context     | current version: 2024.02.14 13:38
>>
>>
>> Any help will be much appreciated.
>>
>> --
>> Andrés Conrado Montoya
>> Andi Kú
>> andresconrado@gmail.com
>> http://sesentaycuatro.com
>> http://messier87.com
>> http://chiquitico.org
>> ----------------------------------------
>> Los fines no justifican los medios, porque la medida verdadera de nuestro
>> carácter está dada por los medios que estamos dispuestos a utilizar, no por
>> los fines que proclamamos.
>> ----------------------------------------
>>
>> “You develop an instant global consciousness, a people orientation, an
>> intense dissatisfaction with the state of the world, and a compulsion to do
>> something about it. From out there on the moon, international politics look
>> so petty. You want to grab a politician by the scruff of the neck and drag
>> him a quarter of a million miles out and say, ‘Look at that, you son of a
>> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>>
>
>
> --
> Andrés Conrado Montoya
> Andi Kú
> andresconrado@gmail.com
> http://sesentaycuatro.com
> http://messier87.com
> http://chiquitico.org
> ----------------------------------------
> Los fines no justifican los medios, porque la medida verdadera de nuestro
> carácter está dada por los medios que estamos dispuestos a utilizar, no por
> los fines que proclamamos.
> ----------------------------------------
>
> “You develop an instant global consciousness, a people orientation, an
> intense dissatisfaction with the state of the world, and a compulsion to do
> something about it. From out there on the moon, international politics look
> so petty. You want to grab a politician by the scruff of the neck and drag
> him a quarter of a million miles out and say, ‘Look at that, you son of a
> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>


-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell

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[-- Attachment #2: Type: text/plain, Size: 511 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: Strange error at lxml-mms.lmt:749

[Aditya Mahajan]

On Sun, 25 Feb 2024, Andres Conrado Montoya wrote:

> Another remark: It seems this behavior is consistent: if I comment out the
> last equation before the one I told you before, again the next formula
> works fine,

Would it be possible to create a reproducible example?

Aditya
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: Strange error at lxml-mms.lmt:749

[Andres Conrado Montoya]

[-- Attachment #1.1: Type: text/plain, Size: 12454 bytes --]

Apologies, I sent the wrong file, this is the relevant log portion after
compiling with the change:

pages           > flushing realpage 133, userpage 133, subpage 133
<msubsup>
    <mi>𝑡</mi>
    <mn>0.975</mn>
    <mo>∗</mo>
   </msubsup>
<msubsup>
    <mi>𝑡</mi>
    <mn>0.025</mn>
    <mo>∗</mo>
   </msubsup>
pages           > flushing realpage 134, userpage 134, subpage 134
pages           > flushing realpage 135, userpage 135, subpage 135
structures      > bookmark: Prueba de homogeneidad
structure       > sectioning > section @ level 3 : 0.7.2 -> Prueba de
homogeneidad
structures      > bookmark: Hipótesis
structure       > sectioning > subsubsection @ level 5 : 0.7.2.0.1 ->
Hipótesis
structures      > bookmark: Estadístico de prueba
structure       > sectioning > subsubsection @ level 5 : 0.7.2.0.2 ->
Estadístico de prueba
structures      > bookmark: Aplicación de la homogeneidad
structure       > sectioning > subsection @ level 4 : 0.7.2.1 -> Aplicación
de la homogeneidad
pages           > flushing realpage 136, userpage 136, subpage 136
floatblocks     > order disturbed
floatblocks     > '51' placed (force)
pages           > flushing realpage 137, userpage 137, subpage 137
floatblocks     > order disturbed
floatblocks     > '52' placed (force)
pages           > flushing realpage 138, userpage 138, subpage 138
close source    > level 2, order 29, name
'include/content/Aplicación-prueba-ji-cuadrado.tex'
pages           > flushing realpage 139, userpage 139, subpage 139
<msubsup>
       <mo>∑</mo>
      </msubsup>
tex error       > tex error on line 85 in file ./IntroEstadísticaNP.tex:

lua error:

        registered function call [250]:
...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:750: attempt to
index a nil value (local 'a2')
stack traceback:
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:750: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:284: in
upvalue 'expandfenced'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:585: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:798: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:350: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:952: in
upvalue 'expand'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:808: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:605: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:952: in
upvalue 'expand'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:899: in
upvalue 'expandone'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:1019:
in field 'verbose'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/math-tag.lmt:985: in
field 'gettextblob'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lpdf-tag.lmt:391: in
upvalue 'makeelement'
        ...mtx/tex/texmf-context/tex/context/base/mkxl/lpdf-tag.lmt:715: in
upvalue 'structures_tags_handler'
        [string "local tonut  = nodes.tonut..."]:21: in function <[string
"local tonut  = nodes.tonut..."]:12>
        (...tail calls...)
        ...mtx/tex/texmf-context/tex/context/base/mkxl/node-shp.lmt:38: in
function <...mtx/tex/texmf-context/tex/context/base/mkxl/node-shp.lmt:37>
        (...tail calls...)

El dom, 25 feb 2024 a las 16:41, Andres Conrado Montoya (<
andresconrado@gmail.com>) escribió:

> IntroEstadisticaNP-error.log:
>
> return {
>  ["filename"]="./IntroEstadísticaNP.tex",
>  ["lastcontext"]="",
>  ["lastluaerror"]="registered function call [250]:
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:490: attempt to
> index a nil value (local 'a2')\nstack traceback:\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:490: in upvalue
> 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:261: in upvalue
> 'expandfenced'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:373: in upvalue
> 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:532: in upvalue
> 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:383: in upvalue
> 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:669: in upvalue
> 'expand'\n ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:544:
> in upvalue 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:383: in upvalue
> 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:669: in upvalue
> 'expand'\n ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:621:
> in upvalue 'expandone'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:669: in upvalue
> 'expand'\n ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:727:
> in field 'verbose'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/math-tag.lmt:939: in field
> 'gettextblob'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lpdf-tag.lmt:391: in upvalue
> 'makeelement'\n
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lpdf-tag.lmt:715: in upvalue
> 'structures_tags_handler'\n [string \"local tonut  = nodes.tonut...\"]:21:
> in function <[string \"local tonut  = nodes.tonut...\"]:12>\n (...tail
> calls...)\n ...mtx/tex/texmf-context/tex/context/base/mkxl/node-shp.lmt:38:
> in function
> <...mtx/tex/texmf-context/tex/context/base/mkxl/node-shp.lmt:37>\n (...tail
> calls...)",
>  ["lasttexerror"]="",
>  ["linenumber"]=85,
>  ["offset"]=10,
>  ["skiplinenumber"]=85,
> }
>
> Also, attached you will find the log files.
>
>
> El dom, 25 feb 2024 a las 15:58, Andres Conrado Montoya (<
> andresconrado@gmail.com>) escribió:
>
>> Another remark: It seems this behavior is consistent: if I comment out
>> the last equation before the one I told you before, again the next formula
>> works fine,
>>
>> El dom, 25 feb 2024 a las 15:38, Andres Conrado Montoya (<
>> andresconrado@gmail.com>) escribió:
>>
>>> A remark: A few lines above the error triggering point, I found a single
>>> digit presented as math: \math{5}. Removing this and leaving the 5 in text
>>> mode removes the error below it.
>>> Could it be a bug in the distribution?
>>>
>>> El dom, 25 feb 2024 a las 15:24, Andres Conrado Montoya (<
>>> andresconrado@gmail.com>) escribió:
>>>
>>>> I keep bumping into this error, I have no idea what may be causing it,
>>>> in a statistics book with lots of math:
>>>>
>>>> registered function call [250]:
>>>> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:749: attempt to
>>>> index a nil value (local 'a2')
>>>>
>>>> I have checked everything. I have tried commenting out many things and
>>>> the weird part is that it fails in a simple math expression: \math{E_{i}j}.
>>>> Even a simple $y$ or \math{a+b} will trigger the error. However, this same
>>>> file Im working on has many formulas before that, those work fine. I
>>>> changed all the $...$ to \math{...} just in case, but with no success.
>>>>
>>>> Already tried remaking, regenerating, updating the distribution.
>>>>
>>>> Do you have any ideas to work this out? I don't know how to provide a
>>>> MWE for this because it's a very big project (statistics book).
>>>>
>>>> I have tried 2 versions, the system-wide one, just upgraded:
>>>> mtx-context     | ConTeXt Process Management 1.06
>>>> mtx-context     | current version: 2024.02.22 18:31
>>>>
>>>> And a less recent version, attached to the project:
>>>> mtx-context     | ConTeXt Process Management 1.05
>>>> mtx-context     | current version: 2024.02.14 13:38
>>>>
>>>>
>>>> Any help will be much appreciated.
>>>>
>>>> --
>>>> Andrés Conrado Montoya
>>>> Andi Kú
>>>> andresconrado@gmail.com
>>>> http://sesentaycuatro.com
>>>> http://messier87.com
>>>> http://chiquitico.org
>>>> ----------------------------------------
>>>> Los fines no justifican los medios, porque la medida verdadera de
>>>> nuestro carácter está dada por los medios que estamos dispuestos a
>>>> utilizar, no por los fines que proclamamos.
>>>> ----------------------------------------
>>>>
>>>> “You develop an instant global consciousness, a people orientation, an
>>>> intense dissatisfaction with the state of the world, and a compulsion to do
>>>> something about it. From out there on the moon, international politics look
>>>> so petty. You want to grab a politician by the scruff of the neck and drag
>>>> him a quarter of a million miles out and say, ‘Look at that, you son of a
>>>> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>>>>
>>>
>>>
>>> --
>>> Andrés Conrado Montoya
>>> Andi Kú
>>> andresconrado@gmail.com
>>> http://sesentaycuatro.com
>>> http://messier87.com
>>> http://chiquitico.org
>>> ----------------------------------------
>>> Los fines no justifican los medios, porque la medida verdadera de
>>> nuestro carácter está dada por los medios que estamos dispuestos a
>>> utilizar, no por los fines que proclamamos.
>>> ----------------------------------------
>>>
>>> “You develop an instant global consciousness, a people orientation, an
>>> intense dissatisfaction with the state of the world, and a compulsion to do
>>> something about it. From out there on the moon, international politics look
>>> so petty. You want to grab a politician by the scruff of the neck and drag
>>> him a quarter of a million miles out and say, ‘Look at that, you son of a
>>> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>>>
>>
>>
>> --
>> Andrés Conrado Montoya
>> Andi Kú
>> andresconrado@gmail.com
>> http://sesentaycuatro.com
>> http://messier87.com
>> http://chiquitico.org
>> ----------------------------------------
>> Los fines no justifican los medios, porque la medida verdadera de nuestro
>> carácter está dada por los medios que estamos dispuestos a utilizar, no por
>> los fines que proclamamos.
>> ----------------------------------------
>>
>> “You develop an instant global consciousness, a people orientation, an
>> intense dissatisfaction with the state of the world, and a compulsion to do
>> something about it. From out there on the moon, international politics look
>> so petty. You want to grab a politician by the scruff of the neck and drag
>> him a quarter of a million miles out and say, ‘Look at that, you son of a
>> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>>
>
>
> --
> Andrés Conrado Montoya
> Andi Kú
> andresconrado@gmail.com
> http://sesentaycuatro.com
> http://messier87.com
> http://chiquitico.org
> ----------------------------------------
> Los fines no justifican los medios, porque la medida verdadera de nuestro
> carácter está dada por los medios que estamos dispuestos a utilizar, no por
> los fines que proclamamos.
> ----------------------------------------
>
> “You develop an instant global consciousness, a people orientation, an
> intense dissatisfaction with the state of the world, and a compulsion to do
> something about it. From out there on the moon, international politics look
> so petty. You want to grab a politician by the scruff of the neck and drag
> him a quarter of a million miles out and say, ‘Look at that, you son of a
> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>


-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell

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[NTG-context] Re: Strange error at lxml-mms.lmt:749

[Andres Conrado Montoya]

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Thank you for your interest, Aditya. The error was kindly fixed by Hans
introducing the following fix at line 993 in
tex/texmf-context/tex/context/base/mkxl/back-exp-imp-mth.lmt:

function extras.msubsup(di,element,n,fulltag)
         local data = di.data
         local nuc = found(data)
         local sup = found(data,"sup")
         local sub = found(data,"sub")
         data[1] = nuc or dummy_nucleus
         data[2] = sub or dummy_nucleus
         data[3] = sup or dummy_nucleus
         data.__i__ = 3
         local sp = specifications[di.fulltag]
         if attributes then
             attributes.mathsupindex = sp.supshifted
             attributes.mathsubindex = sp.subshifted
         else
             di.attributes = {
                 mathsupindex = sp.supshifted,
                 mathsubindex = sp.subshifted,
             }
         end
     end

This solved the issue.

-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________