Forbid the Sized bound on unsized types

closes #16800
Add note about string indexing.

Thanks @chris-morgan!
Revamp doc index

Fixes #14972
Relax lifetime bounds on Reader/Writer impls for trait boxes

Cargo needs this to be able to instantiate `TerminfoTerminal<Box<Writer+'a>>`
for 'a other than 'static.
num: implement `Hash` for `Complex` and `Ratio`
complex: use `///...` instead of `/**...*/` for comment
Detect a traits being used as structs in check_expr_with_unifier

Fixes #16750
Fixes #15812
Added cfail test
Changed error to 'use of trait `{}` as a struct constructor'
Fix win64 regression introduced by #15773

Signed-off-by: Peter Atashian <retep998@gmail.com>
Remove the branch merging optimisations for slice patterns

They were only correct in the simplest case. Some of the optimisations
are certainly possible but should be introduced carefully and only
when the whole pattern codegen infrastructure is in a better shape.

Fixes #16648.
Defailbloat fail!(string)
Allow ExprLit expression macros to be used in patterns.
gensym each test re-export module individually

Fixes #16597
Address review comments, add tests
&mut [T] now implements Collection. Fixes #16896
Add unwrap method to MoveItems
Fix whitespace and missing parentheses.
Rename `RawPtr::to_option()` to `RawPtr::as_ref()`

As outlined in

  https://aturon.github.io/style/naming/conversions.html

`to_` functions names should only be used for expensive operations.
Thus `to_option` is better named `as_option`. Also, putting type
names into method names is considered bad style; what the user is
really trying to get is a reference. This `as_ref` is even better.

Also, we are missing a mutable version of this method. So add a
new trait `RawMutPtr` with a corresponding `as_mut` methode.

Finally, there is a bug in the signature of `to_option` which has
been around since lifetime elision: originally the returned reference
had 'static lifetime, but since the elision changes this become
the lifetime of the raw pointer (which does not make sense, since
the pointer lifetime and referent lifetime are unrelated). Fix
the bug to return a reference with a fresh lifetime (which will
be inferred from the calling context).

[breaking-change]
Have std::io::TempDir::new and new_in return IoResult

This allows using `try!()`

[breaking-change]

Fixes #16875
Make doc search results use <a> tags instead of js for navigating

This has the primary advantage of not interfering with browser default
behavior for links like being able to cmd/ctrl+click on a result to open
the result in a new tab but leave the current page as-is (previous
behavior both opened a new tab and changed the current tab's location to
the result's)