Remove some unused crate dependencies.

I found these by setting the `unused_crate_dependencies` lint
temporarily to `Warn`.

10 files changed, 5 insertions, 28 deletions

diff --git a/compiler/rustc_ast_ir/Cargo.toml b/compiler/rustc_ast_ir/Cargo.toml
index e761b7adad3..a78c91e0615 100644
--- a/compiler/rustc_ast_ir/Cargo.toml
+++ b/compiler/rustc_ast_ir/Cargo.toml
@@ -9,7 +9,6 @@ rustc_data_structures = { path = "../rustc_data_structures", optional = true }
 rustc_macros = { path = "../rustc_macros", optional = true }
 rustc_serialize = { path = "../rustc_serialize", optional = true }
 rustc_span = { path = "../rustc_span", optional = true }
-smallvec = { version = "1.8.1" }
 # tidy-alphabetical-end
 
 [features]
diff --git a/compiler/rustc_baked_icu_data/Cargo.toml b/compiler/rustc_baked_icu_data/Cargo.toml
index 48af4e6f600..e6cfb4887c9 100644
--- a/compiler/rustc_baked_icu_data/Cargo.toml
+++ b/compiler/rustc_baked_icu_data/Cargo.toml
@@ -9,7 +9,6 @@ icu_list = "1.2"
 icu_locid = "1.2"
 icu_locid_transform = "1.3.2"
 icu_provider = "1.2"
-icu_provider_adapters = "1.2"
 zerovec = "0.10.0"
 # tidy-alphabetical-end
 
diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
index 2b61e17efa2..6876046a583 100644
--- a/compiler/rustc_data_structures/Cargo.toml
+++ b/compiler/rustc_data_structures/Cargo.toml
@@ -16,7 +16,6 @@ libc = "0.2"
 measureme = "11"
 rustc-hash = "1.1.0"
 rustc-rayon = { version = "0.5.0", optional = true }
-rustc-rayon-core = { version = "0.5.0", optional = true }
 rustc_arena = { path = "../rustc_arena" }
 rustc_graphviz = { path = "../rustc_graphviz" }
 rustc_index = { path = "../rustc_index", package = "rustc_index" }
@@ -52,5 +51,5 @@ portable-atomic = "1.5.1"
 
 [features]
 # tidy-alphabetical-start
-rustc_use_parallel_compiler = ["indexmap/rustc-rayon", "rustc-rayon", "rustc-rayon-core"]
+rustc_use_parallel_compiler = ["indexmap/rustc-rayon", "rustc-rayon"]
 # tidy-alphabetical-end
diff --git a/compiler/rustc_driver_impl/Cargo.toml b/compiler/rustc_driver_impl/Cargo.toml
index 5f7504add8d..91cbffcd707 100644
--- a/compiler/rustc_driver_impl/Cargo.toml
+++ b/compiler/rustc_driver_impl/Cargo.toml
@@ -19,7 +19,6 @@ rustc_errors = { path = "../rustc_errors" }
 rustc_expand = { path = "../rustc_expand" }
 rustc_feature = { path = "../rustc_feature" }
 rustc_fluent_macro = { path = "../rustc_fluent_macro" }
-rustc_hir = { path = "../rustc_hir" }
 rustc_hir_analysis = { path = "../rustc_hir_analysis" }
 rustc_hir_pretty = { path = "../rustc_hir_pretty" }
 rustc_hir_typeck = { path = "../rustc_hir_typeck" }
diff --git a/compiler/rustc_index_macros/Cargo.toml b/compiler/rustc_index_macros/Cargo.toml
index c4ca29db3c2..07ee81788ce 100644
--- a/compiler/rustc_index_macros/Cargo.toml
+++ b/compiler/rustc_index_macros/Cargo.toml
@@ -7,11 +7,10 @@ edition = "2021"
 proc-macro = true
 
 [dependencies]
-synstructure = "0.13.0"
 syn = { version = "2.0.9", features = ["full"] }
 proc-macro2 = "1"
 quote = "1"
 
 [features]
 default = ["nightly"]
-nightly = []
\ No newline at end of file
+nightly = []
diff --git a/compiler/rustc_middle/Cargo.toml b/compiler/rustc_middle/Cargo.toml
index d1cdabc293d..3dc592980fd 100644
--- a/compiler/rustc_middle/Cargo.toml
+++ b/compiler/rustc_middle/Cargo.toml
@@ -11,7 +11,6 @@ either = "1.5.0"
 field-offset = "0.3.5"
 gsgdt = "0.1.2"
 polonius-engine = "0.13.0"
-rustc-rayon = { version = "0.5.0", optional = true }
 rustc-rayon-core = { version = "0.5.0", optional = true }
 rustc_apfloat = "0.2.0"
 rustc_arena = { path = "../rustc_arena" }
@@ -41,5 +40,5 @@ tracing = "0.1"
 
 [features]
 # tidy-alphabetical-start
-rustc_use_parallel_compiler = ["rustc-rayon", "rustc-rayon-core"]
+rustc_use_parallel_compiler = ["rustc-rayon-core"]
 # tidy-alphabetical-end
diff --git a/compiler/rustc_mir_build/Cargo.toml b/compiler/rustc_mir_build/Cargo.toml
index 77f27236437..5d828d0093f 100644
--- a/compiler/rustc_mir_build/Cargo.toml
+++ b/compiler/rustc_mir_build/Cargo.toml
@@ -5,7 +5,6 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-either = "1"
 itertools = "0.12"
 rustc_apfloat = "0.2.0"
 rustc_arena = { path = "../rustc_arena" }
@@ -24,6 +23,5 @@ rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 rustc_trait_selection = { path = "../rustc_trait_selection" }
-smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tracing = "0.1"
 # tidy-alphabetical-end
diff --git a/compiler/rustc_next_trait_solver/Cargo.toml b/compiler/rustc_next_trait_solver/Cargo.toml
index c30d21fd784..50dbc991f8f 100644
--- a/compiler/rustc_next_trait_solver/Cargo.toml
+++ b/compiler/rustc_next_trait_solver/Cargo.toml
@@ -5,22 +5,9 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-derivative = "2.2.0"
-rustc_ast_ir = { path = "../rustc_ast_ir", default-features = false }
-rustc_data_structures = { path = "../rustc_data_structures", optional = true }
-rustc_macros = { path = "../rustc_macros", optional = true }
-rustc_serialize = { path = "../rustc_serialize", optional = true }
 rustc_type_ir = { path = "../rustc_type_ir", default-features = false }
-rustc_type_ir_macros = { path = "../rustc_type_ir_macros" }
-tracing = "0.1"
 # tidy-alphabetical-end
 
 [features]
 default = ["nightly"]
-nightly = [
-    "rustc_type_ir/nightly",
-    "rustc_macros",
-    "rustc_serialize",
-    "rustc_data_structures",
-    "rustc_ast_ir/nightly",
-]
+nightly = ["rustc_type_ir/nightly"]
diff --git a/compiler/rustc_query_impl/Cargo.toml b/compiler/rustc_query_impl/Cargo.toml
index c57f22a0da2..2bb1be22b98 100644
--- a/compiler/rustc_query_impl/Cargo.toml
+++ b/compiler/rustc_query_impl/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2021"
 # tidy-alphabetical-start
 field-offset = "0.3.5"
 measureme = "11"
-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" }
@@ -23,5 +22,5 @@ tracing = "0.1"
 
 [features]
 # tidy-alphabetical-start
-rustc_use_parallel_compiler = ["rustc-rayon-core", "rustc_query_system/rustc_use_parallel_compiler"]
+rustc_use_parallel_compiler = ["rustc_query_system/rustc_use_parallel_compiler"]
 # tidy-alphabetical-end
diff --git a/compiler/stable_mir/Cargo.toml b/compiler/stable_mir/Cargo.toml
index c61e217bf9f..4ed61152736 100644
--- a/compiler/stable_mir/Cargo.toml
+++ b/compiler/stable_mir/Cargo.toml
@@ -4,5 +4,4 @@ version = "0.1.0-preview"
 edition = "2021"
 
 [dependencies]
-tracing = "0.1"
 scoped-tls = "1.0"