Add test for #18908
Rollback accidental documentation changes

These probably happened during the merge of the commit that made `Copy` opt-in.

Also, convert the last occurence of `/**` to `///` in `src/libstd/num/strconv.rs`
doc: grammar fix
Add doctests for `iter_mut` and `into_iter` of BTreeMap.

Add spacing as dictated by standard rust code style.
Remove references to traits that no longer exist

This specifically means:
- `Deque`
- `Map`
- `Set`
Update sample code to use `getopts::usage` in `print_usage`
Fix an ICE when trying to resolve a struct variant

Unlike a tuple variant constructor which can be called as a function, a
struct variant constructor is not a function, so cannot be called.

If the user tries to assign the constructor to a variable, an ICE
occurs, because there is no way to use it later. So we should stop the
constructor from being used like that.

A similar mechanism already exists for a normal struct, as it prohibits
a struct from being resolved. This commit does the same for a struct
variant.

This commit also includes some changes to the existing tests.

Fixes #19452.
Change default installation directory to %SYSTEMDRIVE%\Rust.
Modify user PATH, rather than system PATH.
Fix two bugs in HRTB: 1. Categorize early-vs-late bindings on impls when constructing    generics, so that we don't add unnecessary region parameters. 2. Correct the DeBruijn indices when substituting the self type    into the method signature.

Previously, the DeBruijn index for the self type was not being
adjusted to account for the fn binder. This mean that when late-bound
regions were instantiated, you sometimes wind up with two distinct
lifetimes.

Fixes #19537.
During method resolution, only reborrow if we are not doing an auto-ref.
The current behavior leads to adjustments like `&&*` being applied
instead of just `&` (when the unmodified receiver is a `&T` or an `&mut
T`). This causes both safety errors and unexpected behavior. The safety
errors result from regionck not being prepared for auto-ref-ref-like
adjustments; this is worth fixing on its own, but I think the best way
to do it is to modify regionck to use expr-use-visitor (and fix
expr-use-visitor as well, which I don't think properly invokes `borrow`
for each level of auto-ref), and for now it's simpler to just not
produce the adjustment in question. (I have a separate patch porting
regionck to use exprusevisitor for a different bug, so that is coming.)
Fix an incorrect type annotation (shadowed lifetime parameter) that was masked by
these bugs.
auto merge of #19377 : tbu-/rust/pr_mapinplace_fixzerosized_test, r=sfackler
Fix ICE when a struct variant enum is imported from an external crate

Fixes the first case of #19340.
Fix ICE when a struct variant enum contains multiple fields

Fixes the second case of #19340.
Register new snapshots
Add LLVM ExecutionEngine API
Perform compiler state reset in phase_1
auto merge of #19672 : alexcrichton/rust/snapshots, r=brson

These snapshots were generated on the 10.7 bot which should be the first step in fixing #19643
Add an implementation of the BitOps for BTreeSets.

Add initial attempt at implementing BitOr for BTreeSet.

Update the implementation of the bitor operator for BTreeSets.

`make check` ran fine through this.

Add implementations for BitAnd, BitXor, and Sub as well.

Remove the FIXME comment and add unstable flags.

Add doctests for the bitop functions.
auto merge of #19514 : jbranchaud/rust/add-btree-set-bitor, r=Gankro

I am trying to add an implementation of `bitor` for `BTreeSet`. I think I am most of the way there, but I am going to need some guidance to take it all the way.

When I run `make check`, I get:

```
error: cannot move out of dereference of `&`-pointer
self.union(_rhs).map(|&i| i).collect::<BTreeSet<T>>()
                      ^~
```

I'd appreciate any nudges in the right direction. If I can figure this one out, I am sure I will be able to implement `bitand`, `bitxor`, and `sub` as well.

/cc @Gankro 

---

**Update**

I have added implementations for `BitOr`, `BitAnd`, `BitXor`, and `Sub` for `BTreeSet`.