Style Question: How should I write a long error message?

General Usage
2

I assume you wouldn’t want any linebreaks in the string, in which case you can escape these literal linebreaks with \ (on Julia 1.7 and newer, IIRC):

julia> println("Lorem interdum nescio ubi sordida iter ducis, interdum nec video cur. \
       Ego coniecto ego servo in ludum properamus, multa cervisia et multa vagabundos inruisse. \
       Facilius quam mori dum circum.")
Lorem interdum nescio ubi sordida iter ducis, interdum nec video cur. Ego coniecto ego servo in ludum properamus, multa cervisia et multa vagabundos inruisse. Facilius quam mori dum circum.
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