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Tue, 2 Jan 2018 12:21:45 +0100
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Alexander Grahn <[log in to unmask]>
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Happy New Year and good afternoon,

Since some l3kernel update in December I am getting kernel/invalid
-variant warnings, as in  

* LaTeX warning: "kernel/invalid-variant"
* 
* Variant form 'cF' invalid for base form '\tl_if_blank:nF'.

It is issued for the line of code

  \cs_generate_variant:Nn\tl_if_blank:nF{cF}

that used to work without warning before. Which is the correct method for
generating variants of conditionals?

Alexander

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