librustc: Allow linkage attribute on any statics, not just foreign statics.
librustc: Respect no-compiler-rt target option for static libs as well.
convert 1 line match to 2 lines for readability
Add `Show` and `Clone` trait to arrays

Due to not being able to parametrize over array sizes, `Clone` is only
implemented for element types that are `Copy`able.
implement cloned for Option
Deprecate hashmap's find_copy and get_copy in favour of cloned and clone
fallout from deprecating find_copy and get_copy
Fixed several typos in libcollections
Implement more basic traits for the marker types.
Fixed a few typos in libcore
auto merge of #18927 : areski/rust/pr-improve-option-match-readl, r=jakub-

**match** are much more easy to read when it's not in 1 single line
Disallow parsing of struct variants with 0 fields

Make struct variant syntax more consistent with struct syntax and fix an
assert in middle::typeck.

Fix #19003
doc: extend a893397 to make whole document consistent
slightly better deprecation message for fn syntax
auto merge of #18914 : Gankro/rust/cloned, r=aturon

Part of #18424. r? @aturon 

[breaking-change]
change return type of slice_shift_char

`slice_shift_char` splits a `str` into it's leading `char` and the remainder
of the `str`. Currently, it returns a `(Option<char>, &str)` such that:

    "bar".slice_shift_char() => (Some('b'), "ar")
    "ar".slice_shift_char()  => (Some('a'), "r")
    "r".slice_shift_char()   => (Some('r'), "")
    "".slice_shift_char()    => (None,      "")

This is a little odd. Either a `str` can be split into both a head and a
tail or it cannot. So the return type should be `Option<(char, &str)>`.
With the current behaviour, in the case of the empty string, the `str`
returned is meaningless - it is always the empty string.

This commit changes slice_shift_char so that:

    "bar".slice_shift_char() => Some(('b', "ar"))
    "ar".slice_shift_char()  => Some(('a', "r"))
    "r".slice_shift_char()   => Some(('r', ""))
    "".slice_shift_char()    => None

[breaking-change]
Fix fallout from coercion removal
auto merge of #19027 : nick29581/rust/coercions-4, r=alexcrichton

The forwards compatible parts of #18645, rebased. Converts implicit coercions from `[T, ..n]` to `&[T]` into explicit references.
libgraphviz: Id::new returns Result<Id, ()> instead of panicking on error

creating a new Id object requires the format to match a subset of `ID` format defined by the DOT language. When the format did not match, the function called assert. This was not mentioned in the docs or the spec. I made the failure explicit by returning an Result<Id, ()>.
auto merge of #19007 : huonw/rust/more-marker-impls, r=alexcrichton

Useful for #[deriving].