Add Bazel-native Dylint support

Introduce explicit Dylint rules, nightly rustc-dev plumbing, and integration coverage for target-local custom lint configs.

Co-authored-by: Codex <noreply@openai.com>

Author: andyscott

README.md

@@ -130,6 +130,13 @@ bazel run @rules_rs//tools/rust_analyzer:gen_rust_project -- --help
 See the upstream `rules_rust` rust-analyzer docs for editor setup details:
 https://bazelbuild.github.io/rules_rust/rust_analyzer.html#vscode
 
+## Dylint
+
+`rules_rs` supports Bazel-native Dylint checks with target-local custom lint bundles,
+so different Rust targets can opt into different project policies without sharing one
+workspace-global Dylint config. See [`docs/dylint.md`](docs/dylint.md) for the design,
+toolchain requirements, and a worked example.
+
 ## Advanced Options
 
 <details>

docs/dylint.md

@@ -20,6 +20,13 @@ bzl_library(
     ],
 )
 
+bzl_library(
+    name = "dylint",
+    srcs = ["dylint.bzl"],
+    visibility = ["//visibility:public"],
+    deps = ["//rs/private:dylint"],
+)
+
 bzl_library(
     name = "rules_rust_reexported_extensions",
     srcs = ["rules_rust_reexported_extensions.bzl"],

rs/BUILD.bazel

@@ -0,0 +1,14 @@
+"""Public Dylint rules for rules_rs."""
+
+load(
+    "//rs/private:dylint.bzl",
+    _dylint_config = "dylint_config",
+    _dylint_library = "dylint_library",
+    _dylint_toolchain = "dylint_toolchain",
+    _rust_dylint = "rust_dylint",
+)
+
+dylint_config = _dylint_config
+dylint_library = _dylint_library
+dylint_toolchain = _dylint_toolchain
+rust_dylint = _rust_dylint

rs/dylint.bzl

@@ -0,0 +1,5 @@
+package(default_visibility = ["//visibility:public"])
+
+toolchain_type(
+    name = "toolchain_type",
+)

rs/dylint/BUILD.bazel

@@ -1,4 +1,5 @@
 load("@bazel_lib//:bzl_library.bzl", "bzl_library")
+load("@rules_rust//rust:defs.bzl", "rust_binary")
 load(":all_crate_deps_test.bzl", "all_crate_deps_tests")
 load(":cfg_parser_test.bzl", "cfg_parser_tests")
 load(":lint_flags_test.bzl", "lint_flags_tests")
@@ -220,6 +221,22 @@ bzl_library(
     deps = ["@rules_rust//rust/private:bzl_lib"],
 )
 
+bzl_library(
+    name = "dylint",
+    srcs = ["dylint.bzl"],
+    visibility = ["//rs:__subpackages__"],
+    deps = [
+        "@rules_rust//rust/private:bzl_lib",
+    ],
+)
+
+rust_binary(
+    name = "dylint_runner",
+    srcs = ["dylint_runner.rs"],
+    edition = "2024",
+    tags = ["manual"],
+)
+
 bzl_library(
     name = "resolver",
     srcs = ["resolver.bzl"],