Merge pull request #1014 from rust-lang/dependabot/cargo/syn-1.0.51

Cargo.lock

@@ -1699,9 +1699,9 @@ checksum = "343f3f510c2915908f155e94f17220b19ccfacf2a64a2a5d8004f2c3e311e7fd"
 
 [[package]]
 name = "syn"
-version = "1.0.50"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "443b4178719c5a851e1bde36ce12da21d74a0e60b4d982ec3385a933c812f0f6"
+checksum = "3b4f34193997d92804d359ed09953e25d5138df6bcc055a71bf68ee89fdf9223"
 dependencies = [
  "proc-macro2",
  "quote",