Fixing permutation of small lists, such that [], [x] -> [[]], [[x]], and updating size_hints.
Fixes #13734 and #13759.
doc: perform some 80-chars wrappings
syntax: `Mod` records the span for inner contents.

this is useful when the module item and module contents are defined
from different files (like rustdoc). in most cases the original span
for the module item would be used; in other cases, the span for
module contents is available separately at the `inner` field.
test: Rename a test to bypass UAC on windows
rustdoc: style tweaks
auto merge of #13783 : wackywendell/rust/permfix, r=kballard

I filed bugs #13734 and #13759 recently, and then realized I could probably fix them myself. This does exactly that, with a couple additional modifications and additions to the test-suite to pick up on that.

I've never done this before, so please feel free to tell me all the things I'm doing wrong or could be doing better.
rustdoc: External module item links to the module contents. Fixes #12926.

the basic strategy is to distinguish `mod foo;` from `mod foo {...}`
by checking if the span for the module item and module contents is
in different files. if it's the case, we prefer module contents.

it is technically possible to fix #12926 without changing the AST,
probably by checking the individual items' span. this is not without
a problem though, since it is possible that some items inside
`mod foo {...}` may have originated from other file (e.g. `include!`).
therefore it is better to record both spans explicitly.
Fix link to hashmap.rs and json.rs in sample code FAQ
Added missing values in std::io::standard_error()
Fixed typo in std::iter
add BigUint subtraction underflow error message
auto merge of #13796 : ema-fox/rust/patch-1, r=kballard
auto merge of #13798 : aochagavia/rust/pr, r=alexcrichton
Rewrote documentation for parse_bytes and to_str_bytes in {int, uint}_macros.rs
Add a streaming parser to serialize::json.
Fix a code formatting issue in json.rs
Update libworkcache with libserialize's json changes
Fix test issue-4016.rs with the json API change
auto merge of #13792 : jacob-hegna/rust/master, r=alexcrichton

Just modified the documentation for parse_bytes to make it more clear how the bytes were parsed (big endian) and to show an example of what it returned.  I also added documentation for the to_str_bytes which previously had no documentation (besides one stackoverflow post).
doc: Remove out-of-place debug! note

As of cc6ec8df, the Owned closures example uses println! instead of
debug!, making a note about seeing debug seem out-of-place in this
section.

Since debug! is not used elsewhere in the tutorial, remove the note
entirely.