Clean up rustc_*/Cargo.toml.

- Sort dependencies and features sections.
- Add `tidy` markers to the sorted sections so they stay sorted.
- Remove empty `[lib`] sections.
- Remove "See more keys..." comments.

Excluded files:
- rustc_codegen_{cranelift,gcc}, because they're external.
- rustc_lexer, because it has external use.
- stable_mir, because it has external use.

compiler/rustc_query_impl/Cargo.toml

@@ -3,24 +3,25 @@ name = "rustc_query_impl"
 version = "0.0.0"
 edition = "2021"
 
-[lib]
-
-
 [dependencies]
+# tidy-alphabetical-start
 field-offset = "0.3.5"
 measureme = "10.0.0"
+rustc-rayon-core = { version = "0.5.0", optional = true }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
 rustc_hir = { path = "../rustc_hir" }
 rustc_index = { path = "../rustc_index" }
 rustc_middle = { path = "../rustc_middle" }
 rustc_query_system = { path = "../rustc_query_system" }
-rustc-rayon-core = { version = "0.5.0", optional = true }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 thin-vec = "0.2.12"
 tracing = "0.1"
+# tidy-alphabetical-end
 
 [features]
+# tidy-alphabetical-start
 rustc_use_parallel_compiler = ["rustc-rayon-core", "rustc_query_system/rustc_use_parallel_compiler"]
+# tidy-alphabetical-end