Latest 0.2 release on crates.io does not compile with nightly anymore

[sdroege]

A newer version of the proc-macro2 crate is needed, and #1003 and possibly #1025

[estk]

@sdroege what nightly are you using? I tried this locally and saw the following:

evan.simmons at esimm-mb15tbr in ~/rust/futures-rs (tags/0.2.1)
$ rustup show
Default host: x86_64-apple-darwin

installed toolchains
--------------------

stable-x86_64-apple-darwin
nightly-x86_64-apple-darwin (default)

active toolchain
----------------

nightly-x86_64-apple-darwin (default)
rustc 1.28.0-nightly (524ad9b9e 2018-05-29)

evan.simmons at esimm-mb15tbr in ~/rust/futures-rs (tags/0.2.1)
$ cargo build
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading syn v0.13.11
   Compiling futures-macro-await v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-macro-await)
   Compiling futures-core v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-core)
   Compiling proc-macro2 v0.3.8
   Compiling futures-channel v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-channel)
   Compiling futures-io v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-io)
   Compiling futures-sink v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-sink)
   Compiling futures-util v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-util)
   Compiling quote v0.5.2
   Compiling syn v0.13.11
   Compiling futures-executor v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-executor)
   Compiling futures-stable v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-stable)
   Compiling futures-async-runtime v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-async-runtime)
   Compiling futures v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures)
   Compiling futures-macro-async v0.2.1 (file:///Users/evan.simmons/rust/futures-rs/futures-macro-async)
    Finished dev [unoptimized + debuginfo] target(s) in 16.15s

[sdroege]

With latest nightly as of today. You have to enable the nightly feature though.

Inside the futures crate (not the workspace):

$ cargo +nightly build --features nightly
   Compiling futures-core v0.2.1 (file:///home/slomo/Projects/rust/futures-rs/futures-core)
   Compiling proc-macro2 v0.3.8
error[E0433]: failed to resolve. Could not find `Pin` in `mem`
   --> futures-core/src/future/mod.rs:150:35
    |
150 |             unsafe { ::core::mem::Pin::get_mut(&mut self.as_pin()).poll(cx) }
    |                                   ^^^ Could not find `Pin` in `mem`

error[E0433]: failed to resolve. Could not find `Pin` in `mem`
  --> futures-core/src/stream/mod.rs:92:35
   |
92 |             unsafe { ::core::mem::Pin::get_mut(&mut self.as_pin()).poll_next(cx) }
   |                                   ^^^ Could not find `Pin` in `mem`

error[E0599]: no method named `as_pin` found for type `&mut std::boxed::PinBox<F>` in the current scope
   --> futures-core/src/future/mod.rs:150:58
    |
150 |             unsafe { ::core::mem::Pin::get_mut(&mut self.as_pin()).poll(cx) }
    |                                                          ^^^^^^

error[E0599]: no method named `as_pin` found for type `&mut std::boxed::PinBox<S>` in the current scope
  --> futures-core/src/stream/mod.rs:92:58
   |
92 |             unsafe { ::core::mem::Pin::get_mut(&mut self.as_pin()).poll_next(cx) }
   |                                                          ^^^^^^

error: aborting due to 4 previous errors

Some errors occurred: E0433, E0599.
For more information about an error, try `rustc --explain E0433`.
error: Could not compile `futures-core`.
warning: build failed, waiting for other jobs to finish...
error[E0433]: failed to resolve. Could not find `Op` in `proc_macro`
   --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:131:42
    |
131 |                 let mut op = proc_macro::Op::new(tt.op(), spacing);
    |                                          ^^ Could not find `Op` in `proc_macro`

error[E0433]: failed to resolve. Could not find `Term` in `proc_macro`
   --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:446:59
    |
446 |             Span::Nightly(s) => Term::Nightly(proc_macro::Term::new(string, s)),
    |                                                           ^^^^ Could not find `Term` in `proc_macro`

error[E0412]: cannot find type `Term` in module `proc_macro`
   --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:439:25
    |
439 |     Nightly(proc_macro::Term),
    |                         ^^^^ not found in `proc_macro`
help: possible candidates are found in other modules, you can import them into scope
    |
3   | use Term;
    |
3   | use imp::Term;
    |
3   | use stable::Term;
    |

error[E0412]: cannot find type `Term` in module `proc_macro`
   --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:473:44
    |
473 |     fn unwrap_nightly(self) -> proc_macro::Term {
    |                                            ^^^^ not found in `proc_macro`
help: possible candidates are found in other modules, you can import them into scope
    |
3   | use Term;
    |
3   | use imp::Term;
    |
3   | use stable::Term;
    |

error[E0599]: no function or associated item named `empty` found for type `proc_macro::TokenStream` in the current scope
  --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:45:34
   |
45 |             TokenStream::Nightly(proc_macro::TokenStream::empty())
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function or associated item not found in `proc_macro::TokenStream`

error[E0599]: no variant named `Op` found for type `proc_macro::TokenTree` in the current scope
   --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:228:13
    |
228 |             proc_macro::TokenTree::Op(tt) => {
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ variant not found in `proc_macro::TokenTree`

error[E0599]: no variant named `Term` found for type `proc_macro::TokenTree` in the current scope
   --> /home/slomo/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/unstable.rs:237:13
    |
237 |             proc_macro::TokenTree::Term(s) => ::Term::_new(Term::Nightly(s)).into(),
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ variant not found in `proc_macro::TokenTree`

error: aborting due to 7 previous errors

Some errors occurred: E0412, E0433, E0599.
For more information about an error, try `rustc --explain E0412`.
error: Could not compile `proc-macro2`.

[cramertj]

stale