Furthermore the example only works in TeXlive 2017 but not in beta.  What has 
changed and how do I
make it work again?

On Wed, 2017-08-09 at 17:00 +1200, Henri wrote:
> Dear list,
> 
> Because I don't like that Euler calligraphic script provided by Latin Modern 
> Math, I want to
> revert
> to Computer Modern for the uppercase calligraphic letters.  I got so far, 
> that the command will
> produce the correct glyphs, however, the kerning is borken.  What did I miss?
> 
> Cheers, Henri
> 
> ---
> 
> % Allocate tokens for legacy math codes
> \newtoks\legacymathcodes\legacymathcodes={
> \Umathcode`A="7"1"41 \Umathcode`B="7"1"42 \Umathcode`C="7"1"43
> \Umathcode`D="7"1"44 \Umathcode`E="7"1"45 \Umathcode`F="7"1"46
> \Umathcode`G="7"1"47 \Umathcode`H="7"1"48 \Umathcode`I="7"1"49
> \Umathcode`J="7"1"4A \Umathcode`K="7"1"4B \Umathcode`L="7"1"4C
> \Umathcode`M="7"1"4D \Umathcode`N="7"1"4E \Umathcode`O="7"1"4F
> \Umathcode`P="7"1"50 \Umathcode`Q="7"1"51 \Umathcode`R="7"1"52
> \Umathcode`S="7"1"53 \Umathcode`T="7"1"54 \Umathcode`U="7"1"55
> \Umathcode`V="7"1"56 \Umathcode`W="7"1"57 \Umathcode`X="7"1"58
> \Umathcode`Y="7"1"59 \Umathcode`Z="7"1"5A
> }
> 
> % Load CM calligraphic
> \font\tensy  =cmsy10 at \mathstyleface\textstyle
> \font\sevensy=cmsy7  at \mathstyleface\scriptstyle
> \font\fivesy =cmsy5  at \mathstyleface\scriptscriptstyle
> 
> % Allocate family
> \newfam\cmcalfam
> 
> % Assign font families
> \textfont        \cmcalfam=\tensy
> \scriptfont      \cmcalfam=\sevensy
> \scriptscriptfont\cmcalfam=\fivesy
> 
> % Make a macro wrapper
> \unexpanded\def\cmcal#1{{\fam\cmcalfam\the\legacymathcodes#1}}
> 
> \starttext
> 
> $\mathcal{TUV}$
> 
> $\cmcal{TUV}$
> 
> \stoptext
> 
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