How can I write a hypergeometric function using typst?

[szdytom]

what I wanted in LaTeX can be compose by:

$\mathrm F\left(\begin{gathered}a,b\\c\end{gathered}\middle|x\right)$

what I try in typst is:

$ upright(F)lr((mat(delim: #none, a_1comma dots comma a_m; b_1 comma dots comma b_m)|x)) $

the thing is all about the \middle directive. There seems no way to get | char longer in typst. it seems that typst should somehow add a lmr function.

[peng1999]

There is a ongoing PR #641 that implements want you want.

[szdytom]

do

$ upright(F)lr((lr(mat(delim: #none, a_1comma dots comma a_m; b_1 comma dots comma b_m)|)x)) $