编译时遇到无法编译proc-macro2的问题

[gelmannt]

rust 版本 1.28.0 nightly

error[E0433]: failed to resolve. Could not find Op in proc_macro
--> /root/.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
--> /root/.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
--> /root/.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
--> /root/.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 variant named Op found for type proc_macro::TokenTree in the current scope
--> /root/.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
--> /root/.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 6 previous errors

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

[iovxw]

上游在修，等两天吧

或者可以先运行 rustup override set nightly-2018-05-03 锁定编译器版本

[gelmannt]

试了一下 rustc nightly 1.27 的情况下也是相同的错误

[iovxw]

不是大版本号，注意日期，nightly 是按天算版本的

[gelmannt]

运行 rustup override set nightly-2018-05-03 锁定编译器后，还是出现相同的编译错误提示

具体的错误信息

The type name used is not in scope.

Erroneous code examples:

impl Something {} // error: type name `Something` is not in scope

// or:

trait Foo {
    fn bar(N); // error: type name `N` is not in scope
}

// or:

fn foo(x: T) {} // type name `T` is not in scope

To fix this error, please verify you didn't misspell the type name, you did
declare it or imported it into the scope. Examples: