Text above or below arrows expects word to start with Captial letter

[gvdeynde]

If the text in the square brackets to be put above or below an arrow starts with a non-capital letter, the parsing goes crazy.

MWE:

#import "@preview/chemformula:0.1.2": ch

#ch("A ->[Test][Below] B")

// #ch("A ->[test][Below] B")

Uncommenting the last line, will give an error

error: unknown variable: test
    ┌─ @preview/chemformula:0.1.2\src\chemformula.typ:212:4
    │
212 │     recursive-parse(chem, mode: mode),
    │     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    │
    = hint: if you meant to display multiple letters as is, try adding spaces be
tween each letter: `t e s t`
    = hint: or if you meant to display this as text, try placing it in quotes: `
"test"`

[pacaunt]

Ah, this happens because the content in the under/over positions of the arrow expect chemical formula by default, which must start with a capital letter like NaCl, H2SO4. For text-specific display, please surround the text with a double quote:

#import "@preview/chemformula:0.1.2": ch

#ch("A ->[Test][Below] B")

#ch("A ->[\"test\"][Below] B") // Notice the escaped \"test\" , or 

#ch(`A ->["test"][Below] B`) // You can input a raw content to use the double quote directly.