unresolved import: there is no `as_utf16_p` in `std::os::win32`

[klutzy]

On win32,

use std::os::win32::as_utf16_p;
fn main() {}

gives "error: unresolved import: there is no as_utf16_p in std::os::win32".

With RUST_LOG=rustc, rustc gives some info:

~"(resolving single import) resolving `as_utf16_p` = `std::os::win32::as_utf16_p` from `???`"
~"(populating external module) attempting to populate std::os::win32"
~"(populating external module) ... found ident: SYSNAME"
~"(building reduced graph for external crate) building value (fn/static) SYSNAME"
~"(populating external module) ... found ident: DLL_PREFIX"
~"(building reduced graph for external crate) building value (fn/static) DLL_PREFIX"
~"(populating external module) ... found ident: DLL_SUFFIX"
~"(building reduced graph for external crate) building value (fn/static) DLL_SUFFIX"
~"(populating external module) ... found ident: EXE_SUFFIX"
~"(building reduced graph for external crate) building value (fn/static) EXE_SUFFIX"
tmp.rs:1:4: 1:30 error: unresolved import: there is no `as_utf16_p` in `std::os::win32`
tmp.rs:1 use std::os::win32::as_utf16_p;
             ^~~~~~~~~~~~~~~~~~~~~~~~~~
tmp.rs:1:4: 1:30 error: failed to resolve import `std::os::win32::as_utf16_p`
tmp.rs:1 use std::os::win32::as_utf16_p;
             ^~~~~~~~~~~~~~~~~~~~~~~~~~

Seems like resolver cannot find any function inside std::os::win32.

[klutzy]

os has pub use os::consts::*; and os::consts has os::consts::win32 which has four static values e.g. SYSNAME or DLL_PREFIX. The original os::win32 module is covered with os::consts::win32.
However I don't know why it my code worked on 0.7 version.

[huonw]

There have been some changes to how metadata is loaded from other crates have possibly affected this.

(cc @pcwalton)

[klutzy]

So this is really a mixture of two issues: export order change (pub use consts::win32; is higher than mod win32 {}) and impossibility to use mod win32.
I'm ok with the first change, but then we should move mod win32 somewhere. Actually it contains only two fns: pub fn fill_utf16_buf_and_decode and pub fn as_utf16_p. They are not win32-dependent, but just win32-convenient. How about moving them to str and export them for all os?