Serde: Panic with proc-macro

[sackery]

error: internal compiler error: ../src/librustc_metadata/decoder.rs:490: entry: id not found: DefIndex(1) in crate "serde_derive" with number 105

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

thread 'rustc' panicked at 'Box', ../src/librustc_errors/lib.rs:424
note: Run with RUST_BACKTRACE=1 for a backtrace.

[dtolnay]

Thanks for the report! This is https://github.com/rust-lang/rust/issues/37788 for which a fix has merged into Rust and will be in tomorrow's nightly.

[dtolnay]

Today's build failed, maybe we'll get it tomorrow.

[sackery]

So slowly. I'll stop to work it today maybe.