`mathcal` incompatible with `unicode-math`

Question

An MWE is like this:
documentclass{article}
usepackage{unicode-math}
DeclareMathAlphabet{mathcal}{OMS}{cmsy}{m}{n}
begin{document}
$ tilde{mathcal{B}} $

% $ hat{mathcal{B}} $
end{document}

The error shows "! Internal error: bad native font flag in `map_char_to_glyph'".
It seems that DeclareMathAlphabet{mathcal}{OMS}{cmsy}{m}{n} is not compatible with unicode-math. Any advice is appreciated!

Davislor · Accepted Answer

You’re trying to load an old-fashioned NFSS font command, which is incompatible with unicode-math.
To load a new mathcal alphabet from an OpenType font, use the range= option of setmathfont, for example,
documentclass{article}
usepackage{unicode-math}

setmathfont{XITS Math}[
  Scale = MatchUppercase ]
setmathfont{Latin Modern Math}[
  range = {cal,bfcal},
  Scale = MatchUppercase ]

begin{document}
[ mathcal{ABC} quad mathscr{ABC} ]
end{document}

This loads both the mathcal and mathbfcal alphabets, and scales the fonts so that their capital letters are the same height.

`mathcal` incompatible with `unicode-math`

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