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Joker_vD | on: Copper – A minimal low-level programming language with OOP and generics
Surprisingly, the most irritating nitpick for me is the choice of the file extension — surely that should've been ".cu", not ".co"? If I were developing an e.g. Iron programming language (hypothetically — although perhaps so named a language already exists), I'd pick ".fe" in a heartbeat.

Then again, I'm the kind of person who've chosen $'.\U0001F9CC' (that is, $'.\xF0\x9F\xA7\x8C') for a file extension of my own toy language so...

vopi | parent | next
Unfortunately for Copper in particular, .cu is associated with CUDA (so perhaps that’s why).
mixmastamyk | root | parent | next
And don’t ask what it means in Portuguese.
mxkopy | root | parent
My first thought
dapperhn | parent | next
Not a programming language, but Jane Street has (had?) a code review tool called Iron, abbreviated "fe".

https://blog.janestreet.com/code-review-that-isnt-boring/

pdpi | root | parent
And they’re not alone — mercurial is hg and the silver searcher is ag.
anonymous908213 | parent | next
I like the way you think.
mikkelam | parent
You're appreciated