error: field is never used: fnv_hash

[ignatenkobrain]

   Compiling syntex_syntax v0.59.0 (file:///builddir/build/BUILD/syntex_syntax-0.59.0)
     Running `/usr/bin/rustc --crate-name syntex_syntax src/lib.rs --crate-type lib --emit=dep-info,link -C opt-level=3 -C metadata=b50fa25c4c5de602 -C extra-filename=-b50fa25c4c5de602 --out-dir /builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps -L dependency=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps --extern serde_derive=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libserde_derive-c6f9114eef047c78.so --extern syntex_pos=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libsyntex_pos-7931c493dc6b5e21.rlib --extern unicode_xid=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libunicode_xid-79f25df02c186583.rlib --extern syntex_errors=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libsyntex_errors-3f0509037dca9b6d.rlib --extern extprim=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libextprim-e50bc0cca579e484.rlib --extern serde_json=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libserde_json-f08a34ce468f736d.rlib --extern bitflags=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libbitflags-750c808327703e7c.rlib --extern log=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/liblog-993417d12efa90f4.rlib --extern serde=/builddir/build/BUILD/syntex_syntax-0.59.0/target/release/deps/libserde-c2adbce777e1076d.rlib -Copt-level=3 -Cdebuginfo=2 -Clink-arg=-Wl,-z,relro,-z,now`
error: field is never used: `fnv_hash`
  --> src/rustc_data_structures/blake2b.rs:35:5
   |
35 |     fnv_hash: u64,
   |     ^^^^^^^^^^^^^
   |
   = note: #[deny(dead_code)] implied by #[deny(warnings)]
note: lint level defined here
  --> src/lib.rs:21:9
   |
21 | #![deny(warnings)]
   |         ^^^^^^^^

• cargo-0.19.0-1.fc27.x86_64
• rust-1.18.0-1.fc27.x86_64