Merge pull request #1084 from rust-lang/dependabot/cargo/syn-1.0.57

Cargo.lock

@@ -1664,9 +1664,9 @@ checksum = "1e81da0851ada1f3e9d4312c704aa4f8806f0f9d69faaf8df2f3464b4a9437c2"
 
 [[package]]
 name = "syn"
-version = "1.0.56"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9802ddde94170d186eeee5005b798d9c159fa970403f1be19976d0cfb939b72"
+checksum = "4211ce9909eb971f111059df92c45640aad50a619cf55cd76476be803c4c68e6"
 dependencies = [
  "proc-macro2",
  "quote",