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diff --git a/Master/texmf-dist/doc/support/expltools/w200.tex b/Master/texmf-dist/doc/support/expltools/w200.tex
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+\cs_new:Npn
+ \show_until_if:w % warning on this line
+ #1 \if^^zw % warning on this line
+ { \tl_show:n {#1} }
+\show_until_if:^^7 % warning on this line
+ \tex_if:D % warning on this line
+ \if_charcode:^^77 % warning on this line
+ \if^^3aw % warning on this line