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Resolved for now

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All the weirdness mentioned in the "Error messages" section has gone away now that I have temporarily patched Module:Convert to use Module:Mwlocal instead of Module:Mw. I think some change in Scribunto must have created a global mw variable, and there is some problem in the new code? And that caused the stuff below? Johnuniq (talk) 07:36, 13 February 2013 (UTC)

Error messages

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The following conversions should give an error message as the result, but they should not give a "Script error".


Some results from various tests follow. I suspect these may not always occur as it may depend on some internal state of mw.lua or MediaWiki. I have definitely seen a "Script error" disappear (and stay disappeared after a browser refresh) when ?action=purge was appended to URL).

*{{convert}}              Script error
*{{convert|1.2}}          Conversion error: Need name of unit
*{{convert|1.2|xyz|m}}    Conversion error: Unit "xyz" is not known.
*{{convert|1.2|ftin|m}}   Conversion error: Unit "ftin" is invalid here.

Previewing following then gave these results:

*{{convert|1.2}}          Script error
*{{convert|1.2|xyz|m}}    Conversion error: Unit "xyz" is not known.
*{{convert|1.2|ftin|m}}   Conversion error: Unit "ftin" is invalid here.

Previewing following then gave these results:

*{{convert|1.2|xyz|m}}    Script error
*{{convert|1.2|ftin|m}}   Conversion error: Unit "ftin" is invalid here.

Previewing following then gave these results:

*{{convert|1.2|ftin|m}}   Script error

Previewing following then gave these results:

*{{convert|1.2}}          Script error

Previewing following then gave these results (all correct and as expected):

*{{convert|1.2|m|ftin}}   1.2 metres (3 ft 11 in)
*{{convert}}              Conversion error: Need value
*{{convert|1.2}}          Conversion error: Need name of unit
*{{convert|1.2|xyz|m}}    Conversion error: Unit "xyz" is not known.
*{{convert|1.2|ftin|m}}   Conversion error: Unit "ftin" is invalid here.

Conclusion: A bug somewhere requires the code in Module:Convert to run successfully once (without invoking Module:Mw) before a second erroneous template makes convert.lua uses mw.lua to report an error message.

Investigate problem using cutdown code

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Following returns plain text if argument is "good", or an error message formatted by mw otherwise.

  • [good][TWO]
  • [bad][TWO]