Generate WidgetPath

[EPashkin]

Apply of gtk-rs/gir#552,
also contains fixes for async's

cc @GuillaumeGomez, @sdroege

[GuillaumeGomez]

Holy crap:

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', libcore/option.rs:335:21
note: Run with `RUST_BACKTRACE=1` for a backtrace.
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.25.0-nightly (b1f8e6fb0 2018-02-22) running on x86_64-unknown-linux-gnu
error: Could not document `glib`.

I have a fix to write for rustdoc now I suppose...

[EPashkin]

Maybe this helps little: it seems documented fine in

>rustc -Vv
rustc 1.25.0-nightly (3ec5a99aa 2018-02-14)
binary: rustc
commit-hash: 3ec5a99aaa0084d97a9e845b34fdf03d1462c475
commit-date: 2018-02-14
host: x86_64-pc-windows-gnu
release: 1.25.0-nightly
LLVM version: 6.0

glib>cargo -Vv
cargo 0.26.0-nightly (1d6dfea44 2018-01-26)
release: 0.26.0
commit-hash: 1d6dfea44f97199d5d5c177c7dadcde393eaff9a
commit-date: 2018-01-26

but failed on current version:

D:\eap\rust\0\glib>rustc -Vv
rustc 1.25.0-nightly (b1f8e6fb0 2018-02-22)
binary: rustc
commit-hash: b1f8e6fb06d7362eeb2065347a7db94e76b1cb2f
commit-date: 2018-02-22
host: x86_64-pc-windows-gnu
release: 1.25.0-nightly
LLVM version: 6.0

D:\eap\rust\0\glib>cargo -Vv
cargo 0.26.0-nightly (1d6dfea44 2018-01-26)
release: 0.26.0
commit-hash: 1d6dfea44f97199d5d5c177c7dadcde393eaff9a
commit-date: 2018-01-26

 Documenting glib v0.4.1 (file:///D:/eap/rust/0/glib)
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', libcore\option.rs:335:21
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: mingw_set_invalid_parameter_handler
   1: mingw_set_invalid_parameter_handler
   2: mingw_set_invalid_parameter_handler
   3: mingw_set_invalid_parameter_handler
   4: mingw_set_invalid_parameter_handler
   5: mingw_set_invalid_parameter_handler
   6: mingw_set_invalid_parameter_handler
   7: mingw_set_invalid_parameter_handler
   8: mingw_set_invalid_parameter_handler
   9: mingw_set_invalid_parameter_handler
  10: mingw_set_invalid_parameter_handler
  11: mingw_set_invalid_parameter_handler
  12: mingw_set_invalid_parameter_handler
  13: mingw_set_invalid_parameter_handler
  14: mingw_set_invalid_parameter_handler
  15: rustdoc::clean::get_auto_traits_with_def_id
             at librustdoc\clean/auto_trait.rs:21
             at librustdoc\clean/mod.rs:3372
  16: rustdoc::clean::inline::build_impls
             at librustdoc\clean/inline.rs:246
  17: rustdoc::clean::build_deref_target_impls
             at librustdoc\clean/mod.rs:3431
  18: <rustdoc::doctree::Impl as rustdoc::clean::Clean<alloc::vec::Vec<rustdoc::clean::Item>>>::clean
             at librustdoc\clean/mod.rs:3384
  19: <rustdoc::doctree::Module as rustdoc::clean::Clean<rustdoc::clean::Item>>::clean
             at librustdoc\clean/mod.rs:541
             at C:\projects\rust\src\libcore\ops/function.rs:271
             at C:\projects\rust\src\libcore/option.rs:404
             at C:\projects\rust\src\libcore\iter/mod.rs:2448
             at C:\projects\rust\src\liballoc/vec.rs:1906
             at C:\projects\rust\src\liballoc/vec.rs:1803
             at C:\projects\rust\src\liballoc/vec.rs:1767
             at librustdoc\clean/mod.rs:541
  20: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::spec_extend
             at librustdoc\clean/mod.rs:536
             at C:\projects\rust\src\libcore\ops/function.rs:271
             at C:\projects\rust\src\libcore/option.rs:404
             at C:\projects\rust\src\libcore\iter/mod.rs:1311
             at C:\projects\rust\src\liballoc/vec.rs:1829
  21: <rustdoc::doctree::Module as rustdoc::clean::Clean<rustdoc::clean::Item>>::clean
             at C:\projects\rust\src\liballoc/vec.rs:1767
             at librustdoc\clean/mod.rs:536
  22: <rustdoc::visit_ast::RustdocVisitor<'a, 'tcx, 'rcx> as rustdoc::clean::Clean<rustdoc::clean::Crate>>::clean
             at librustdoc\clean/mod.rs:166
  23: rustdoc::core::run_core::{{closure}}
             at librustdoc/core.rs:270
  24: rustc::ty::context::TyCtxt::create_and_enter
             at C:\projects\rust\src\librustc_driver/driver.rs:1094
             at C:\projects\rust\src\librustc\ty/context.rs:1573
             at C:\projects\rust\src\libstd\thread/local.rs:377
             at C:\projects\rust\src\libstd\thread/local.rs:288
             at C:\projects\rust\src\librustc\ty/context.rs:1570
             at C:\projects\rust\src\librustc\ty/context.rs:1557
             at C:\projects\rust\src\libstd\thread/local.rs:377
             at C:\projects\rust\src\libstd\thread/local.rs:288
             at C:\projects\rust\src\librustc\ty/context.rs:1554
             at C:\projects\rust\src\librustc\ty/context.rs:1197
  25: rustdoc::core::run_core
             at C:\projects\rust\src\librustc_driver/driver.rs:1007
             at librustdoc/core.rs:217

error: internal compiler error: unexpected panic

[EPashkin]

Done full regen

[GuillaumeGomez]

I'll copy your comment on the rustc issue.

[GuillaumeGomez]

And code seems however I'll just wait that the rustdoc issue is solved before merging it (sorry). I'll do it before the end of the day.

[EPashkin]

No problem 😉

[GuillaumeGomez]

Let's retry. A fix for an ICE got merged yesterday so maybe the problem is already solved...

[EPashkin]

Seems not 😭

[GuillaumeGomez]

Yep, I think it comes from last nightly.

[GuillaumeGomez]

It's fixed in this PR.

[EPashkin]

Rebased. I hope that error really fixed

[EPashkin]

CI passed 🎉

[GuillaumeGomez]

Then I merge. Thanks!