Remove rustc-workspace-hack

Cargo.lock

@@ -468,12 +468,6 @@ version = "0.6.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
 
-[[package]]
-name = "rustc-workspace-hack"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc71d2faa173b74b232dedc235e3ee1696581bb132fc116fa3626d6151a1a8fb"
-
 [[package]]
 name = "rustfmt-config_proc_macro"
 version = "0.3.0"
@@ -502,7 +496,6 @@ dependencies = [
  "lazy_static",
  "log",
  "regex",
- "rustc-workspace-hack",
  "rustfmt-config_proc_macro",
  "serde",
  "serde_json",

Cargo.toml

@@ -59,11 +59,6 @@ unicode_categories = "0.1"
 
 rustfmt-config_proc_macro = { version = "0.3", path = "config_proc_macro" }
 
-# A noop dependency that changes in the Rust repository, it's a bit of a hack.
-# See the `src/tools/rustc-workspace-hack/README.md` file in `rust-lang/rust`
-# for more information.
-rustc-workspace-hack = "1.0.0"
-
 # Rustc dependencies are loaded from the sysroot, Cargo doesn't know about them.
 
 [package.metadata.rust-analyzer]