Merge pull request #2553 from topecongiro/rustc-ap-syntax

Update rustc-ap-syntax to 73.0.0

Author: nrc

Cargo.lock

@@ -46,7 +46,7 @@ env_logger = "0.5"
 getopts = "0.2"
 derive-new = "0.5"
 cargo_metadata = "0.5.1"
-rustc-ap-syntax = "67.0.0"
+rustc-ap-syntax = "73.0.0"
 
 [dev-dependencies]
 lazy_static = "1.0.0"