I wrote a few hundred lines about bout a year or two ago and about 2k the last few months. It's definately gotten better and there's something in the works for most of the things I took issue with which is kind of nice but doesn't really help if you're not on nightly.
Specific pain points for me were:
- the lack of traits for numeric primitives/types without pulling in the num crate
- the difficulty working with floating point types
- the inconsistent type annotations in fn signatures
- the type annotations are a bit clunky no easy way to alias
- and auto deref mechanics especially via match statement
- having to fully specify a type in a match statement or use Self::Type
- the use mechanism makes no sense
- no optional/default arguments without macros leads to a lot of shimming/boilerplate
- having to split operations because the borrow checker can't do partials or non lexical lifetimes
- the clunky range syntax wich makes writing invertible/reversible functions really ugly and error prone due to lack of inclusive range and I really can't believe the committee decided to go ahead with ..= instead of ... It's really out of line compared to pretty much every other language is doing
- doesn't seem like there's a good way to nicely format long lines
Overall I still really like the language but I really don't see it taking off until these issues are fixed because it makes it so hard to start up.
