rust-lang · bors · Mar 9, 2025 · Mar 6, 2025 · Mar 7, 2025 · Mar 6, 2025
diff --git a/Cargo.toml b/Cargo.toml
@@ -63,6 +63,20 @@ exclude = [
   "src/tools/x",
 ]
 
+# These lints are applied to many crates in the workspace. In practice, this is
+# all crates under `compiler/`.
+#
+# NOTE: rustc-specific lints (e.g. `rustc::internal`) aren't supported by
+# Cargo. (Support for them is possibly blocked by #44690 (attributes for
+# tools).) Those lints are instead specified for `compiler/` crates in
+# `src/bootstrap/src/core/builder/cargo.rs`.
+[workspace.lints.rust]
+# FIXME(edition_2024): Change this to `-Wrust_2024_idioms` when all of the
+# individual lints are satisfied.
+keyword_idents_2024 = "warn"
+unreachable_pub = "warn"
+unsafe_op_in_unsafe_fn = "warn"
+
 [profile.release.package.rustc-rayon-core]
 # The rustc fork of Rayon has deadlock detection code which intermittently
 # causes overflows in the CI (see https://github.com/rust-lang/rust/issues/90227)

diff --git a/compiler/rustc/Cargo.toml b/compiler/rustc/Cargo.toml
@@ -32,3 +32,6 @@ llvm = ['rustc_driver_impl/llvm']
 max_level_info = ['rustc_driver_impl/max_level_info']
 rustc_randomized_layouts = ['rustc_driver_impl/rustc_randomized_layouts']
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_abi/Cargo.toml b/compiler/rustc_abi/Cargo.toml
@@ -31,3 +31,6 @@ nightly = [
 ]
 randomize = ["dep:rand", "dep:rand_xoshiro", "nightly"]
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs
@@ -5,7 +5,6 @@
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
 #![cfg_attr(feature = "nightly", feature(rustdoc_internals))]
 #![cfg_attr(feature = "nightly", feature(step_trait))]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 /*! ABI handling for rustc

diff --git a/compiler/rustc_arena/Cargo.toml b/compiler/rustc_arena/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2024"
 # tidy-alphabetical-start
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_arena/src/lib.rs b/compiler/rustc_arena/src/lib.rs
@@ -23,7 +23,6 @@
 #![feature(maybe_uninit_slice)]
 #![feature(rustc_attrs)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::alloc::Layout;

diff --git a/compiler/rustc_ast/Cargo.toml b/compiler/rustc_ast/Cargo.toml
@@ -18,3 +18,6 @@ smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.12"
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_ast/src/lib.rs b/compiler/rustc_ast/src/lib.rs
@@ -19,7 +19,6 @@
 #![feature(never_type)]
 #![feature(rustdoc_internals)]
 #![feature(stmt_expr_attributes)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 pub mod util {

diff --git a/compiler/rustc_ast_ir/Cargo.toml b/compiler/rustc_ast_ir/Cargo.toml
@@ -19,3 +19,6 @@ nightly = [
     "dep:rustc_macros",
     "dep:rustc_span",
 ]
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_ast_ir/src/lib.rs b/compiler/rustc_ast_ir/src/lib.rs
@@ -9,7 +9,6 @@
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", feature(never_type))]
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 #[cfg(feature = "nightly")]

diff --git a/compiler/rustc_ast_lowering/Cargo.toml b/compiler/rustc_ast_lowering/Cargo.toml
@@ -28,3 +28,6 @@ smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.12"
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
@@ -38,7 +38,6 @@
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::sync::Arc;

diff --git a/compiler/rustc_ast_passes/Cargo.toml b/compiler/rustc_ast_passes/Cargo.toml
@@ -20,3 +20,6 @@ rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 thin-vec = "0.2.12"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_ast_passes/src/lib.rs b/compiler/rustc_ast_passes/src/lib.rs
@@ -10,7 +10,6 @@
 #![feature(iter_is_partitioned)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 pub mod ast_validation;

diff --git a/compiler/rustc_ast_pretty/Cargo.toml b/compiler/rustc_ast_pretty/Cargo.toml
@@ -12,3 +12,6 @@ rustc_lexer = { path = "../rustc_lexer" }
 rustc_span = { path = "../rustc_span" }
 thin-vec = "0.2.12"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_ast_pretty/src/lib.rs b/compiler/rustc_ast_pretty/src/lib.rs
@@ -3,7 +3,6 @@
 #![doc(rust_logo)]
 #![feature(box_patterns)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 mod helpers;

diff --git a/compiler/rustc_attr_data_structures/Cargo.toml b/compiler/rustc_attr_data_structures/Cargo.toml
@@ -14,3 +14,6 @@ rustc_serialize = {path = "../rustc_serialize"}
 rustc_span = {path = "../rustc_span"}
 thin-vec = "0.2.12"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_attr_data_structures/src/lib.rs b/compiler/rustc_attr_data_structures/src/lib.rs
@@ -3,7 +3,6 @@
 #![doc(rust_logo)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 mod attributes;

diff --git a/compiler/rustc_attr_parsing/Cargo.toml b/compiler/rustc_attr_parsing/Cargo.toml
@@ -21,3 +21,6 @@ rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 thin-vec = "0.2.12"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_attr_parsing/src/lib.rs b/compiler/rustc_attr_parsing/src/lib.rs
@@ -80,7 +80,6 @@
 #![doc(rust_logo)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 #[macro_use]

diff --git a/compiler/rustc_baked_icu_data/Cargo.toml b/compiler/rustc_baked_icu_data/Cargo.toml
@@ -11,3 +11,6 @@ icu_locid_transform = "1.3.2"
 icu_provider = { version = "1.2", features = ["sync"] }
 zerovec = "0.10.0"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_baked_icu_data/src/lib.rs b/compiler/rustc_baked_icu_data/src/lib.rs
@@ -23,9 +23,9 @@
 // tidy-alphabetical-start
 #![allow(elided_lifetimes_in_paths)]
 #![allow(internal_features)]
+#![allow(unreachable_pub)] // because this crate is mostly generated code
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-// #![warn(unreachable_pub)] // don't use because this crate is mostly generated code
 // tidy-alphabetical-end
 
 mod data {

diff --git a/compiler/rustc_borrowck/Cargo.toml b/compiler/rustc_borrowck/Cargo.toml
@@ -27,3 +27,6 @@ rustc_traits = { path = "../rustc_traits" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
@@ -13,7 +13,6 @@
 #![feature(rustdoc_internals)]
 #![feature(stmt_expr_attributes)]
 #![feature(try_blocks)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::borrow::Cow;

diff --git a/compiler/rustc_builtin_macros/Cargo.toml b/compiler/rustc_builtin_macros/Cargo.toml
@@ -3,10 +3,6 @@ name = "rustc_builtin_macros"
 version = "0.0.0"
 edition = "2024"
 
-
-[lints.rust]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(llvm_enzyme)'] }
-
 [lib]
 doctest = false
 
@@ -34,3 +30,6 @@ smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.12"
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_builtin_macros/src/lib.rs b/compiler/rustc_builtin_macros/src/lib.rs
@@ -18,7 +18,6 @@
 #![feature(rustdoc_internals)]
 #![feature(string_from_utf8_lossy_owned)]
 #![feature(try_blocks)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 extern crate proc_macro;

diff --git a/compiler/rustc_codegen_llvm/Cargo.toml b/compiler/rustc_codegen_llvm/Cargo.toml
@@ -43,3 +43,6 @@ serde_json = "1"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -19,7 +19,6 @@
 #![feature(rustdoc_internals)]
 #![feature(slice_as_array)]
 #![feature(try_blocks)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::any::Any;

diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -63,3 +63,6 @@ features = ["read_core", "elf", "macho", "pe", "xcoff", "unaligned", "archive",
 [target.'cfg(windows)'.dependencies.windows]
 version = "0.59.0"
 features = ["Win32_Globalization"]
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -14,7 +14,6 @@
 #![feature(rustdoc_internals)]
 #![feature(trait_alias)]
 #![feature(try_blocks)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).

diff --git a/compiler/rustc_const_eval/Cargo.toml b/compiler/rustc_const_eval/Cargo.toml
@@ -26,3 +26,6 @@ rustc_trait_selection = { path = "../rustc_trait_selection" }
 rustc_type_ir = { path = "../rustc_type_ir" }
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
@@ -16,7 +16,6 @@
 #![feature(unqualified_local_imports)]
 #![feature(yeet_expr)]
 #![warn(unqualified_local_imports)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 pub mod check_consts;

diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
@@ -54,3 +54,6 @@ memmap2 = "0.2.1"
 
 [target.'cfg(not(target_has_atomic = "64"))'.dependencies]
 portable-atomic = "1.5.1"
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_data_structures/src/graph/tests.rs b/compiler/rustc_data_structures/src/graph/tests.rs
@@ -3,15 +3,15 @@ use std::cmp::max;
 use super::*;
 use crate::fx::FxHashMap;
 
-pub struct TestGraph {
+pub(super) struct TestGraph {
     num_nodes: usize,
     start_node: usize,
     successors: FxHashMap<usize, Vec<usize>>,
     predecessors: FxHashMap<usize, Vec<usize>>,
 }
 
 impl TestGraph {
-    pub fn new(start_node: usize, edges: &[(usize, usize)]) -> Self {
+    pub(super) fn new(start_node: usize, edges: &[(usize, usize)]) -> Self {
         let mut graph = TestGraph {
             num_nodes: start_node + 1,
             start_node,

diff --git a/compiler/rustc_data_structures/src/obligation_forest/mod.rs b/compiler/rustc_data_structures/src/obligation_forest/mod.rs
@@ -313,7 +313,7 @@ pub struct Error<O, E> {
 
 mod helper {
     use super::*;
-    pub type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
+    pub(super) type ObligationTreeIdGenerator = impl Iterator<Item = ObligationTreeId>;
     impl<O: ForestObligation> ObligationForest<O> {
         pub fn new() -> ObligationForest<O> {
             ObligationForest {

diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs
@@ -88,7 +88,7 @@ mod mode {
 
     // Whether thread safety might be enabled.
     #[inline]
-    pub fn might_be_dyn_thread_safe() -> bool {
+    pub(super) fn might_be_dyn_thread_safe() -> bool {
         DYN_THREAD_SAFE_MODE.load(Ordering::Relaxed) != DYN_NOT_THREAD_SAFE
     }
 

diff --git a/compiler/rustc_data_structures/src/sync/parallel.rs b/compiler/rustc_data_structures/src/sync/parallel.rs
@@ -46,7 +46,7 @@ pub fn parallel_guard<R>(f: impl FnOnce(&ParallelGuard) -> R) -> R {
     ret
 }
 
-pub fn serial_join<A, B, RA, RB>(oper_a: A, oper_b: B) -> (RA, RB)
+fn serial_join<A, B, RA, RB>(oper_a: A, oper_b: B) -> (RA, RB)
 where
     A: FnOnce() -> RA,
     B: FnOnce() -> RB,

diff --git a/compiler/rustc_data_structures/src/tagged_ptr/tests.rs b/compiler/rustc_data_structures/src/tagged_ptr/tests.rs
@@ -7,7 +7,7 @@ use crate::stable_hasher::{HashStable, StableHasher};
 
 /// A tag type used in [`TaggedRef`] tests.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub enum Tag2 {
+enum Tag2 {
     B00 = 0b00,
     B01 = 0b01,
     B10 = 0b10,

diff --git a/compiler/rustc_driver/Cargo.toml b/compiler/rustc_driver/Cargo.toml
@@ -10,3 +10,6 @@ crate-type = ["dylib"]
 # tidy-alphabetical-start
 rustc_driver_impl = { path = "../rustc_driver_impl" }
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_driver_impl/Cargo.toml b/compiler/rustc_driver_impl/Cargo.toml
@@ -79,3 +79,6 @@ rustc_randomized_layouts = [
     'rustc_middle/rustc_randomized_layouts'
 ]
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
@@ -16,7 +16,6 @@
 #![feature(result_flattening)]
 #![feature(rustdoc_internals)]
 #![feature(try_blocks)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::cmp::max;

diff --git a/compiler/rustc_error_codes/Cargo.toml b/compiler/rustc_error_codes/Cargo.toml
@@ -6,3 +6,6 @@ edition = "2024"
 [dependencies]
 # tidy-alphabetical-start
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_error_codes/src/lib.rs b/compiler/rustc_error_codes/src/lib.rs
@@ -6,7 +6,6 @@
 #![deny(rustdoc::invalid_codeblock_attributes)]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 // This higher-order macro defines the error codes that are in use. It is used

diff --git a/compiler/rustc_error_messages/Cargo.toml b/compiler/rustc_error_messages/Cargo.toml
@@ -19,3 +19,6 @@ rustc_span = { path = "../rustc_span" }
 tracing = "0.1"
 unic-langid = { version = "0.9.0", features = ["macros"] }
 # tidy-alphabetical-end
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
@@ -4,7 +4,6 @@
 #![feature(rustc_attrs)]
 #![feature(rustdoc_internals)]
 #![feature(type_alias_impl_trait)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use std::borrow::Cow;

diff --git a/compiler/rustc_errors/Cargo.toml b/compiler/rustc_errors/Cargo.toml
@@ -39,3 +39,6 @@ features = [
     "Win32_Security",
     "Win32_System_Threading",
 ]
+
+[lints]
+workspace = true
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
@@ -24,7 +24,6 @@
 #![feature(trait_alias)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 extern crate self as rustc_errors;