aster 0.7.0 fails to compile

[zr40]

On rustc 1.6.0-nightly (9303055f3 2015-11-19), the following build failure happens when compiling aster 0.7.0:

% cargo build
   Compiling aster v0.7.0
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:950:35: 950:49 error: use of undeclared type name `ast::ImplItem_` [E0412]
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:950     pub fn build_item(self, node: ast::ImplItem_) -> F::Result {
                                                                                                                                                       ^~~~~~~~~~~~~~
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:950:35: 950:49 help: run `rustc --explain E0412` to see a detailed explanation
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:979:20: 979:38 error: unresolved name `ast::ConstImplItem` [E0425]
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:979         let node = ast::ConstImplItem(const_.ty, const_.expr.expect("an expr is required for a const impl item"));
                                                                                                                                        ^~~~~~~~~~~~~~~~~~
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:979:20: 979:38 help: run `rustc --explain E0425` to see a detailed explanation
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:990:20: 990:39 error: unresolved name `ast::MethodImplItem` [E0425]
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:990         let node = ast::MethodImplItem(method.sig, method.block.expect("a block is required for a method impl item"));
                                                                                                                                        ^~~~~~~~~~~~~~~~~~~
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:990:20: 990:39 help: run `rustc --explain E0425` to see a detailed explanation
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:1001:20: 1001:37 error: unresolved name `ast::TypeImplItem` [E0425]
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:1001         let node = ast::TypeImplItem(ty);
                                                                                                                                         ^~~~~~~~~~~~~~~~~
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:1001:20: 1001:37 help: run `rustc --explain E0425` to see a detailed explanation
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:1012:20: 1012:36 error: unresolved name `ast::MacImplItem` [E0425]
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:1012         let node = ast::MacImplItem(mac);
                                                                                                                                         ^~~~~~~~~~~~~~~~
/Users/zr40/.multirust/toolchains/nightly/cargo/registry/src/github.com-0a35038f75765ae4/aster-0.7.0/src/item.rs:1012:20: 1012:36 help: run `rustc --explain E0425` to see a detailed explanation
error: aborting due to 5 previous errors
Could not compile `aster`.

To learn more, run the command again with --verbose.

[gregkatz]

Seems to be caused by a fairly recent change to nightly. I had this problem on one machine, but not the other and multirust update caused it to occur on both machines.

I got it to build with a nightly from Nov. 11, 2015, if that helps narrow down the problem.