That sounds terrible, is Rust that unstable in practice today? I remember hearing that the language had mostly stabilized at the end of 2014, but anecdotes like yours are discouraging.
There had been some breaking changes going on towards the 1.0 release. The first alpha to clean that up was in January of this year which really started the move to stabilize a lot of things, but there were still some breaking changes (I know there were a few around IO). It went beta back in April and there haven't been any serious breaking changes since (that I know of, I'm only following things not a rust developer). Tomorrow it'll be released as the 1.0 stable version that from then on you won't have any breaking changes (until 2.0, or whatever the next version is). That's not too unusual for a language that has been evolving the way rust has, you just can't avoid breaking changes for a while until you actually figure out what works the way you're after. But kudos to the rust team for getting it this far; I can't wait to see all the celebration tomorrow.
I wouldn't call it terrible. It was a language under development, I expected breakage. They're stabilizing now for a final release, so it shouldn't be an issue going forward.
There were some expected periods of instability at the beginning of this year, but recently, there's been little to no breakage. I know because I maintain several crates and I'm not getting pinged every day with new PRs fixing my code. :-)
