cognitive psychology. PhD 
I train Rust since 4 years (Meetup, Hack & Learn and actually as a paid trainer for 3 years now) and I _hate_ it when people bring up "learnability" in language RFCs. Most of the time, it's a bit of anecdata, scrapped together.
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We literally don't know if our language is good or bad there. Being part of a teaching foundation, 25-50% drop-out rates are not _unusual_. (Note, anecdata!)
That's totally fair. I can't rigorously back the claim that Rust is significantly more or less hard to learn than other languages. Only that anecdotally people seem to struggle with it in practice (and it certainly has a reputation as a difficult language).
