and rename "class" to "struct" everywhere possible (except local
vars, I was too lazy for that) -- that is why this commit is so
big.

No review, just dead code removal and renaming.

Closes #3515

I actually already pushed most of this by accident before I meant to, but
r=nmatsakis anyway.

Closes #3953

As per #3953

Exit with a fatal error, instead of recording a non-fatal error,
when we encounter an impl method that's static when its corresponding
trait method isn't (or vice versa). This is because code later on in
the typechecker will expect the staticness of the two methods to be
consistent and ICE otherwise.

r=nmatsakis

Closes #3969

librustc: Require the #[derivable] attribute, remove the significance of "impl Foo : Bar;", and allow only a subset of methods in a trait to be derived. r=brson

Fixes #1896 which was never truly fixed, just masked.
The given tests would have failed had they used `~fn()` and
not `@fn()`.  They now result in compilation errors.

Fixes #2978.

Necessary first step for #2202, #2263.

rustc: Stop overwriting trait static method types when checking generic trait refs. Closes #3903. rs=blocking-burg

rustc: Instantiate trait refs for automatically-derived implementations. Should fix check-fast. rs=bustage

Change ast::ty_param_bound so that all ty param bounds are represented
as traits, with no special cases for Copy/Send/Owned/Const.
typeck::collect generates the special cases.

A consequence of this is that code using the #[no_core] attribute
can't use the Copy kind/trait. Probably not a big deal?

As a side effect, any user-defined traits that happen to be called
Copy, etc. in the same module override the built-in Copy trait.

r=nmatsakis

Closes #2284

This commit replaces nearly all remaining uses of #fmt, #debug, #error,
and #info, and fixes some error messages...

This reverts commit ed3689d5.

Note that the method foo.each() is not de-moded, nor the other
vec routines.

This reverts commit 1be24f07.

Not quite ready.