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I am using TexStudio and define some personal commands with \DeclareRobustCommand{\foo}{bar}. Unfortunately my TexStudio does not recognize \foo as a new command. Thus I had the idea to write

\DeclareRobustCommand{\foo}{bar} \let\foo\foo

Now TexStudio recognizes \foo as a command. I want to ask, if the construction \let\foo\foo has some drawbacks or is forbidden for some reason.

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    Well, this works and has no drawbacks, as far as I know, but the question should be rather: Why does TeXStudio not recognize macros being defined with \DeclareRobustCommand ? – user31729 Jan 7 '18 at 10:59
  • No problem as far as I can see; but wouldn't it be better to ask TeXStudio maintainers to add support for such standard constructions? – egreg Jan 7 '18 at 10:59
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    To be on the 'safe' side: \DeclareRobustCommand{\foohelper}{bar} \let\foo\foohelper – user31729 Jan 7 '18 at 11:00
  • @ChristianHupfer better would be \let\foo\relax\DeclareRobustCommand{\foo}{bar}, imho. – Skillmon Jan 7 '18 at 12:28
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I see no problem whatsoever for \DeclareRobustCommand with my version of TeXStudio

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The problem appears with \NewDocumentCommand, instead, but the solution is not using \let\fooNDC\fooNDC, but rather \providecommand. Indeed, if I add the \let, the orange background doesn't disappear.

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Of course, asking for TeXStudio support would be the best solution. By the way, TeXStudio recognizes \NewDocumentCommand as soon as \usepackage{xparse} is scanned, but not commands defined with it. Probably it's an easy fix for the developers.

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