serde_derive's build is failing on nightly

[viniciusd]

With the latest nightly build (nightly-2019-07-11), serde is not building anymore.
It does build with yesterday's (nightly-2019-07-10).

It seems to be some change at the syn's Token trait location. I am giving it a look, but I am a beginner here.

Example:

error[E0433]: failed to resolve: unresolved import
   --> serde_derive/src/internals/ast.rs:142:44
    |
142 |     variants: &'a Punctuated<syn::Variant, Token![,]>,
    |                                            ^^^^^^^^^
    |                                            |
    |                                            unresolved import
    |                                            help: a similar path exists: `syn::token`
    |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
error[E0433]: failed to resolve: unresolved import
   --> serde_derive/src/internals/ast.rs:187:40
    |
187 |     fields: &'a Punctuated<syn::Field, Token![,]>,
    |                                        ^^^^^^^^^
    |                                        |
    |                                        unresolved import
    |                                        help: a similar path exists: `syn::token`
    |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

[dtolnay]

This is a compiler bug: rust-lang/rust#62562. Please use an older compiler for now.