r?
This fixes the current [random failures](http://buildbot.rust-lang.org/builders/auto-linux/builds/291/steps/test/logs/stdio) on the bots and closes#4436 by removing `unwrap_shared_mutable_state` and the code that depends on it. The result is that ARC-like things will not be unwrappable. This feature is complex and is not used outside of test cases.
Note that there is not consensus to remove it.
(second commit)
The first two commits are the actual fix going into place, and the last is just dealing with the fallout in the rest of the compiler.
The test added in the first two commits had 0 failures before this patch, and if the glob imports were changed to explicit imports then the errors showed up. Due to this behavior, I figured that the desired behavior was for glob imports to not accidentally leak a lot of non-public imports/functions/types into other modules.
There was quite a lot of fallout, and it all passes `make check` locally, but I doubt that it will pass on all platforms because there's probably some guarded off thing I missed.
I plan on making another patch soon which changes the default level of `unused_imports` to `warn` which will hopefully reduce a lot of the `use` noise throughout. In conjunction with #5104, and a few minor fixes, I think that the default level of `warn` is actually really usable.
This removes all but 6 uses of `drop {}` from the entire codebase. Removing any of the remaining uses causes various non-trivial bugs; I'll start reporting them once this gets merged.
See issue #4869. I'm not quite sure what constitutes "consensus from the core team" (cf. discussion in the issue), but this at least demonstrates that the proposed change is pretty straightforward.
After this change, there are no new test failures. I've un-ignored the `to_str` vectors test; it's not at all obvious to me why it'd be problematic, and it passes on my Linux machine.
Major changes are:
- replace ~[ty_param] with Generics structure, which includes
both OptVec<TyParam> and OptVec<Lifetime>;
- the use of syntax::opt_vec to avoid allocation for empty lists;
cc #4846
r? @graydon
Major changes are:
- replace ~[ty_param] with Generics structure, which includes
both OptVec<TyParam> and OptVec<Lifetime>;
- the use of syntax::opt_vec to avoid allocation for empty lists;
cc #4846
* replace the dual next() and get() calls with a single next() function
* drop one of the pointer members from the struct
* add a method for using the lazy iterator with a for loop
* replace the dual next() and get() calls with a single next() function
* drop one of the pointer members from the struct
* add a method for using the lazy iterator with a for loop
