From a894c4c41324863f0abcd90a2971e8a133aa7089 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <neikos@neikos.email>
Date: Tue, 4 Mar 2025 11:40:38 +0100
Subject: [PATCH 1/6] Add initial workspace
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <neikos@neikos.email>
---
 .gitignore                           |    5 +
 Cargo.lock                           | 1643 ++++++++++++++++++++++++++
 Cargo.toml                           |    3 +
 lints/dashmap-ref/.cargo/config.toml |    6 +
 lints/dashmap-ref/.gitignore         |    1 +
 lints/dashmap-ref/Cargo.toml         |   18 +
 lints/dashmap-ref/README.md          |   21 +
 lints/dashmap-ref/rust-toolchain     |    3 +
 lints/dashmap-ref/src/lib.rs         |   57 +
 lints/dashmap-ref/ui/main.rs         |    1 +
 lints/dashmap-ref/ui/main.stderr     |    0
 11 files changed, 1758 insertions(+)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 lints/dashmap-ref/.cargo/config.toml
 create mode 100644 lints/dashmap-ref/.gitignore
 create mode 100644 lints/dashmap-ref/Cargo.toml
 create mode 100644 lints/dashmap-ref/README.md
 create mode 100644 lints/dashmap-ref/rust-toolchain
 create mode 100644 lints/dashmap-ref/src/lib.rs
 create mode 100644 lints/dashmap-ref/ui/main.rs
 create mode 100644 lints/dashmap-ref/ui/main.stderr

diff --git a/.gitignore b/.gitignore
index 9b42106..277a2bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,6 @@
 .direnv/
+
+
+# Added by cargo
+
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..830f23c
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1643 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9bbdea1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,3 @@
+[workspace]
+
+members = [ "lints/*" ]
diff --git a/lints/dashmap-ref/.cargo/config.toml b/lints/dashmap-ref/.cargo/config.toml
new file mode 100644
index 0000000..226eca5
--- /dev/null
+++ b/lints/dashmap-ref/.cargo/config.toml
@@ -0,0 +1,6 @@
+[target.'cfg(all())']
+rustflags = ["-C", "linker=dylint-link"]
+
+# For Rust versions 1.74.0 and onward, the following alternative can be used
+# (see https://github.com/rust-lang/cargo/pull/12535):
+# linker = "dylint-link"
diff --git a/lints/dashmap-ref/.gitignore b/lints/dashmap-ref/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/lints/dashmap-ref/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/lints/dashmap-ref/Cargo.toml b/lints/dashmap-ref/Cargo.toml
new file mode 100644
index 0000000..fb04676
--- /dev/null
+++ b/lints/dashmap-ref/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "dashmap_ref"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "19e305bb57a7595f2a8d81f521c0dd8bf854e739" }
+dylint_linting = "4.0.0"
+
+[dev-dependencies]
+dylint_testing = "4.0.0"
+
+[package.metadata.rust-analyzer]
+rustc_private = true
diff --git a/lints/dashmap-ref/README.md b/lints/dashmap-ref/README.md
new file mode 100644
index 0000000..e983893
--- /dev/null
+++ b/lints/dashmap-ref/README.md
@@ -0,0 +1,21 @@
+# template
+
+### What it does
+
+### Why is this bad?
+
+### Known problems
+
+Remove if none.
+
+### Example
+
+```rust
+// example code where a warning is issued
+```
+
+Use instead:
+
+```rust
+// example code that does not raise a warning
+```
diff --git a/lints/dashmap-ref/rust-toolchain b/lints/dashmap-ref/rust-toolchain
new file mode 100644
index 0000000..4297c5e
--- /dev/null
+++ b/lints/dashmap-ref/rust-toolchain
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2025-01-09"
+components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/dashmap-ref/src/lib.rs b/lints/dashmap-ref/src/lib.rs
new file mode 100644
index 0000000..fce89f0
--- /dev/null
+++ b/lints/dashmap-ref/src/lib.rs
@@ -0,0 +1,57 @@
+#![feature(rustc_private)]
+#![feature(let_chains)]
+#![warn(unused_extern_crates)]
+
+extern crate rustc_arena;
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_data_structures;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_pretty;
+extern crate rustc_index;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_middle;
+extern crate rustc_mir_dataflow;
+extern crate rustc_parse;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+
+use rustc_lint::LateLintPass;
+
+dylint_linting::declare_late_lint! {
+    /// ### What it does
+    ///
+    /// ### Why is this bad?
+    ///
+    /// ### Known problems
+    ///
+    /// Remove if none.
+    ///
+    /// ### Example
+    ///
+    /// ```rust
+    /// // example code where a warning is issued
+    /// ```
+    ///
+    /// Use instead:
+    ///
+    /// ```rust
+    /// // example code that does not raise a warning
+    /// ```
+    pub DASHMAP_REF,
+    Warn,
+    "description goes here"
+}
+
+impl<'tcx> LateLintPass<'tcx> for DashmapRef {
+    // A list of things you might check can be found here:
+    // https://doc.rust-lang.org/stable/nightly-rustc/rustc_lint/trait.LateLintPass.html
+}
+
+#[test]
+fn ui() {
+    dylint_testing::ui_test(env!("CARGO_PKG_NAME"), "ui");
+}
diff --git a/lints/dashmap-ref/ui/main.rs b/lints/dashmap-ref/ui/main.rs
new file mode 100644
index 0000000..f328e4d
--- /dev/null
+++ b/lints/dashmap-ref/ui/main.rs
@@ -0,0 +1 @@
+fn main() {}
diff --git a/lints/dashmap-ref/ui/main.stderr b/lints/dashmap-ref/ui/main.stderr
new file mode 100644
index 0000000..e69de29

From ac995ea5221936d40c0f07e6dd0780e1ac78b2d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <neikos@neikos.email>
Date: Tue, 4 Mar 2025 11:42:31 +0100
Subject: [PATCH 2/6] Add cargo-hakari
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <neikos@neikos.email>
---
 .config/hakari.toml   | 27 +++++++++++++++++++++++++++
 Cargo.lock            |  4 ++++
 Cargo.toml            |  2 +-
 flake.nix             |  2 ++
 hakari/.gitattributes |  4 ++++
 hakari/Cargo.toml     | 18 ++++++++++++++++++
 hakari/build.rs       |  2 ++
 hakari/src/lib.rs     |  1 +
 8 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 .config/hakari.toml
 create mode 100644 hakari/.gitattributes
 create mode 100644 hakari/Cargo.toml
 create mode 100644 hakari/build.rs
 create mode 100644 hakari/src/lib.rs

diff --git a/.config/hakari.toml b/.config/hakari.toml
new file mode 100644
index 0000000..2cb2d81
--- /dev/null
+++ b/.config/hakari.toml
@@ -0,0 +1,27 @@
+# This file contains settings for `cargo hakari`.
+# See https://docs.rs/cargo-hakari/latest/cargo_hakari/config for a full list of options.
+
+hakari-package = "hakari"
+
+# Format version for hakari's output. Version 4 requires cargo-hakari 0.9.22 or above.
+dep-format-version = "4"
+
+# Setting workspace.resolver = "2" or higher in the root Cargo.toml is HIGHLY recommended.
+# Hakari works much better with the v2 resolver. (The v2 and v3 resolvers are identical from
+# hakari's perspective, so you're welcome to set either.)
+#
+# For more about the new feature resolver, see:
+# https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#cargos-new-feature-resolver
+resolver = "2"
+
+# Add triples corresponding to platforms commonly used by developers here.
+# https://doc.rust-lang.org/rustc/platform-support.html
+platforms = [
+    # "x86_64-unknown-linux-gnu",
+    # "x86_64-apple-darwin",
+    # "aarch64-apple-darwin",
+    # "x86_64-pc-windows-msvc",
+]
+
+# Write out exact versions rather than a semver range. (Defaults to false.)
+# exact-versions = true
diff --git a/Cargo.lock b/Cargo.lock
index 830f23c..f787eb1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -510,6 +510,10 @@ dependencies = [
  "regex-syntax",
 ]
 
+[[package]]
+name = "hakari"
+version = "0.1.0"
+
 [[package]]
 name = "hashbrown"
 version = "0.15.2"
diff --git a/Cargo.toml b/Cargo.toml
index 9bbdea1..9613345 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,3 @@
 [workspace]
 
-members = [ "lints/*" ]
+members = [ "hakari" , "lints/*" ]
diff --git a/flake.nix b/flake.nix
index 8c73fa6..5d416d5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -47,6 +47,8 @@
           nativeBuildInputs = [
             rustTarget
             dylint
+
+            pkgs.cargo-hakari
           ];
         };
       }
diff --git a/hakari/.gitattributes b/hakari/.gitattributes
new file mode 100644
index 0000000..3e9dba4
--- /dev/null
+++ b/hakari/.gitattributes
@@ -0,0 +1,4 @@
+# Avoid putting conflict markers in the generated Cargo.toml file, since their presence breaks
+# Cargo.
+# Also do not check out the file as CRLF on Windows, as that's what hakari needs.
+Cargo.toml merge=binary -crlf
diff --git a/hakari/Cargo.toml b/hakari/Cargo.toml
new file mode 100644
index 0000000..8078f36
--- /dev/null
+++ b/hakari/Cargo.toml
@@ -0,0 +1,18 @@
+# This file is generated by `cargo hakari`.
+# To regenerate, run:
+#     cargo hakari generate
+
+[package]
+name = "hakari"
+version = "0.1.0"
+edition = "2021"
+description = "workspace-hack package, managed by hakari"
+# You can choose to publish this crate: see https://docs.rs/cargo-hakari/latest/cargo_hakari/publishing.
+publish = false
+
+# The parts of the file between the BEGIN HAKARI SECTION and END HAKARI SECTION comments
+# are managed by hakari.
+
+### BEGIN HAKARI SECTION
+
+### END HAKARI SECTION
diff --git a/hakari/build.rs b/hakari/build.rs
new file mode 100644
index 0000000..92518ef
--- /dev/null
+++ b/hakari/build.rs
@@ -0,0 +1,2 @@
+// A build script is required for cargo to consider build dependencies.
+fn main() {}
diff --git a/hakari/src/lib.rs b/hakari/src/lib.rs
new file mode 100644
index 0000000..22489f6
--- /dev/null
+++ b/hakari/src/lib.rs
@@ -0,0 +1 @@
+// This is a stub lib.rs.

From 6813a9ed4316b1dd919d0d39ae996cbafc8d711e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <neikos@neikos.email>
Date: Tue, 4 Mar 2025 11:42:57 +0100
Subject: [PATCH 3/6] Generate cargo-hakari deps
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <neikos@neikos.email>
---
 Cargo.lock        | 10 ++++++++++
 Cargo.toml        |  2 ++
 hakari/Cargo.toml | 18 ++++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index f787eb1..42d775f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -513,6 +513,16 @@ dependencies = [
 [[package]]
 name = "hakari"
 version = "0.1.0"
+dependencies = [
+ "aho-corasick",
+ "dylint_internal",
+ "log",
+ "regex-automata",
+ "regex-syntax",
+ "serde",
+ "smallvec",
+ "syn",
+]
 
 [[package]]
 name = "hashbrown"
diff --git a/Cargo.toml b/Cargo.toml
index 9613345..0b79f92 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,5 @@
 [workspace]
 
 members = [ "hakari" , "lints/*" ]
+
+resolver = "2"
diff --git a/hakari/Cargo.toml b/hakari/Cargo.toml
index 8078f36..8fe64f3 100644
--- a/hakari/Cargo.toml
+++ b/hakari/Cargo.toml
@@ -14,5 +14,23 @@ publish = false
 # are managed by hakari.
 
 ### BEGIN HAKARI SECTION
+[dependencies]
+aho-corasick = { version = "1" }
+dylint_internal = { version = "4", default-features = false, features = ["config", "git", "packaging", "rustup", "sed"] }
+log = { version = "0.4", default-features = false, features = ["std"] }
+regex-automata = { version = "0.4", default-features = false, features = ["dfa-onepass", "hybrid", "meta", "nfa", "perf", "unicode"] }
+regex-syntax = { version = "0.8" }
+serde = { version = "1", features = ["derive"] }
+smallvec = { version = "1", default-features = false, features = ["const_generics", "union"] }
+
+[build-dependencies]
+aho-corasick = { version = "1" }
+dylint_internal = { version = "4", default-features = false, features = ["config", "git", "packaging", "rustup", "sed"] }
+log = { version = "0.4", default-features = false, features = ["std"] }
+regex-automata = { version = "0.4", default-features = false, features = ["dfa-onepass", "hybrid", "meta", "nfa", "perf", "unicode"] }
+regex-syntax = { version = "0.8" }
+serde = { version = "1", features = ["derive"] }
+smallvec = { version = "1", default-features = false, features = ["const_generics", "union"] }
+syn = { version = "2", features = ["extra-traits", "fold", "visit"] }
 
 ### END HAKARI SECTION

From 4e968aaea016262bff1408779dd1ed1c5db3b0ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <neikos@neikos.email>
Date: Tue, 4 Mar 2025 12:11:22 +0100
Subject: [PATCH 4/6] Make lint run
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <neikos@neikos.email>
---
 Cargo.lock                       |  2 +-
 Cargo.toml                       |  6 ++++
 flake.nix                        | 57 +++++++++++++++++++++++++++++++-
 lints/dashmap-ref/Cargo.toml     |  2 +-
 lints/dashmap-ref/rust-toolchain |  3 --
 rust-toolchain.toml              |  3 +-
 6 files changed, 66 insertions(+), 7 deletions(-)
 delete mode 100644 lints/dashmap-ref/rust-toolchain

diff --git a/Cargo.lock b/Cargo.lock
index 42d775f..ab776c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -215,7 +215,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "dashmap_ref"
+name = "dashmap-ref"
 version = "0.1.0"
 dependencies = [
  "clippy_utils",
diff --git a/Cargo.toml b/Cargo.toml
index 0b79f92..4aa0a1b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,3 +3,9 @@
 members = [ "hakari" , "lints/*" ]
 
 resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+
+[workspace.metadata.crane]
+name = "dylints-various"
diff --git a/flake.nix b/flake.nix
index 5d416d5..8282425 100644
--- a/flake.nix
+++ b/flake.nix
@@ -32,6 +32,9 @@
           ];
         };
 
+        inherit (pkgs) lib;
+
+        toolchain = (builtins.fromTOML (builtins.readFile ./rust-toolchain.toml)).toolchain.channel;
         rustTarget = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
 
         dylintLib = inputs.dylint.mkLib {
@@ -39,7 +42,57 @@
           inherit (inputs) crane;
         };
 
-        lints = [ ];
+        craneLib = (inputs.crane.mkLib pkgs).overrideToolchain rustTarget;
+
+        src = craneLib.cleanCargoSource ./.;
+
+        commonLintArgs = {
+          inherit src;
+          strictDeps = true;
+
+          buildInputs = [ pkgs.openssl ];
+          nativeBuildInputs = [ pkgs.pkg-config ];
+
+          DOCS_RS = "true";
+          RUSTUP_TOOLCHAIN = toolchain;
+        };
+
+        cargoArtifacts = craneLib.buildDepsOnly commonLintArgs;
+
+        individualLintArgs = commonLintArgs // {
+          inherit cargoArtifacts;
+          inherit (craneLib.crateNameFromCargoToml { inherit src; }) version;
+
+          doCheck = false;
+        };
+
+        fileSetForCrate =
+          crate:
+          lib.fileset.toSource {
+            root = ./.;
+            fileset = lib.fileset.unions [
+              ./Cargo.lock
+              ./Cargo.toml
+              (craneLib.fileset.commonCargoSources ./hakari)
+              (craneLib.fileset.commonCargoSources crate)
+            ];
+          };
+
+        dashmap-ref = craneLib.buildPackage (
+          individualLintArgs
+          // {
+            pname = "dashmap-ref";
+            cargoExtraArgs = "-p dashmap-ref";
+            src = fileSetForCrate ./lints/dashmap-ref;
+          }
+        );
+
+        lints = [
+          {
+            inherit toolchain;
+            package = dashmap-ref;
+          }
+        ];
         dylint = dylintLib.mkDylint { inherit lints; };
       in
       {
@@ -49,6 +102,8 @@
             dylint
 
             pkgs.cargo-hakari
+            pkgs.openssl
+            pkgs.pkg-config
           ];
         };
       }
diff --git a/lints/dashmap-ref/Cargo.toml b/lints/dashmap-ref/Cargo.toml
index fb04676..b6b2511 100644
--- a/lints/dashmap-ref/Cargo.toml
+++ b/lints/dashmap-ref/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "dashmap_ref"
+name = "dashmap-ref"
 version = "0.1.0"
 edition = "2021"
 publish = false
diff --git a/lints/dashmap-ref/rust-toolchain b/lints/dashmap-ref/rust-toolchain
deleted file mode 100644
index 4297c5e..0000000
--- a/lints/dashmap-ref/rust-toolchain
+++ /dev/null
@@ -1,3 +0,0 @@
-[toolchain]
-channel = "nightly-2025-01-09"
-components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index c1bc0a6..4297c5e 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,2 +1,3 @@
 [toolchain]
-channel = "1.85.0"
+channel = "nightly-2025-01-09"
+components = ["llvm-tools-preview", "rustc-dev"]

From bf589f7d28cce20c2139e7c1c3f9020a347ec5b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <neikos@neikos.email>
Date: Tue, 4 Mar 2025 12:22:12 +0100
Subject: [PATCH 5/6] Fix building of lints
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <neikos@neikos.email>
---
 Cargo.lock                   | 1 +
 flake.nix                    | 4 ++++
 lints/dashmap-ref/Cargo.toml | 1 +
 3 files changed, 6 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index ab776c8..9e19293 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -221,6 +221,7 @@ dependencies = [
  "clippy_utils",
  "dylint_linting",
  "dylint_testing",
+ "hakari",
 ]
 
 [[package]]
diff --git a/flake.nix b/flake.nix
index 8282425..5822811 100644
--- a/flake.nix
+++ b/flake.nix
@@ -84,6 +84,10 @@
             pname = "dashmap-ref";
             cargoExtraArgs = "-p dashmap-ref";
             src = fileSetForCrate ./lints/dashmap-ref;
+
+            postFixup = ''
+              mv $out/lib/libdashmap_ref{.so,@$RUSTUP_TOOLCHAIN.so}
+            '';
           }
         );
 
diff --git a/lints/dashmap-ref/Cargo.toml b/lints/dashmap-ref/Cargo.toml
index b6b2511..70c7ba3 100644
--- a/lints/dashmap-ref/Cargo.toml
+++ b/lints/dashmap-ref/Cargo.toml
@@ -10,6 +10,7 @@ crate-type = ["cdylib"]
 [dependencies]
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "19e305bb57a7595f2a8d81f521c0dd8bf854e739" }
 dylint_linting = "4.0.0"
+hakari = { version = "0.1", path = "../../hakari" }
 
 [dev-dependencies]
 dylint_testing = "4.0.0"

From ace01a20963f1f53f2cdce84b52a5321604eb85a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20M=C3=BCller?= <neikos@neikos.email>
Date: Tue, 4 Mar 2025 14:57:46 +0100
Subject: [PATCH 6/6] Write lint to check for dashmaps entries being held
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Marcel Müller <neikos@neikos.email>
---
 Cargo.lock                       |  64 +++++++++++++++-
 Cargo.toml                       |   1 +
 flake.lock                       |   6 +-
 flake.nix                        |   3 +
 lints/dashmap-ref/Cargo.toml     |   5 ++
 lints/dashmap-ref/src/lib.rs     | 123 +++++++++++++++++++++++++-----
 lints/dashmap-ref/ui/main.rs     |  51 ++++++++++++-
 lints/dashmap-ref/ui/main.stderr | 126 +++++++++++++++++++++++++++++++
 8 files changed, 355 insertions(+), 24 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 9e19293..0cb1191 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -82,6 +82,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
 
+[[package]]
+name = "autocfg"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
+
 [[package]]
 name = "bitflags"
 version = "2.9.0"
@@ -204,6 +210,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
+
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -214,11 +226,26 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "dashmap"
+version = "6.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5041cc499144891f3790297212f32a74fb938e5136a14943f338ef9e0ae276cf"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+ "hashbrown 0.14.5",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core",
+]
+
 [[package]]
 name = "dashmap-ref"
 version = "0.1.0"
 dependencies = [
  "clippy_utils",
+ "dashmap",
  "dylint_linting",
  "dylint_testing",
  "hakari",
@@ -525,6 +552,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+
 [[package]]
 name = "hashbrown"
 version = "0.15.2"
@@ -704,7 +737,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c9c992b02b5b4c94ea26e32fe5bccb7aa7d9f390ab5c1221ff895bc7ea8b652"
 dependencies = [
  "equivalent",
- "hashbrown",
+ "hashbrown 0.15.2",
 ]
 
 [[package]]
@@ -812,6 +845,16 @@ version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23fb14cb19457329c82206317a5663005a4d404783dc74f4252769b0d5f42856"
 
+[[package]]
+name = "lock_api"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07af8b9cdd281b7915f413fa73f29ebd5d55d0d3f0155584dade1ff18cea1b17"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
 [[package]]
 name = "log"
 version = "0.4.26"
@@ -873,6 +916,19 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
+[[package]]
+name = "parking_lot_core"
+version = "0.9.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e401f977ab385c9e4e3ab30627d6f26d00e2c73eef317493c4ec6d468726cf8"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "paste"
 version = "1.0.15"
@@ -1055,6 +1111,12 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
 [[package]]
 name = "semver"
 version = "1.0.26"
diff --git a/Cargo.toml b/Cargo.toml
index 4aa0a1b..9c3ce8b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ resolver = "2"
 
 [workspace.package]
 version = "0.1.0"
+edition = "2021"
 
 [workspace.metadata.crane]
 name = "dylints-various"
diff --git a/flake.lock b/flake.lock
index be43e8f..d3f6d4f 100644
--- a/flake.lock
+++ b/flake.lock
@@ -31,11 +31,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1741084643,
-        "narHash": "sha256-pohp+9ekX2rBuoew8MNoqkZKaez6q4n+8j/K6SSfTrE=",
+        "lastModified": 1741089216,
+        "narHash": "sha256-5ZBaJ0XvjakoZwpHPj6oGzwCcCrcREQlNuDklQfZAxQ=",
         "owner": "TheNeikos",
         "repo": "nix-dylint",
-        "rev": "c88fde3de47277b3d0c1f16f740ff8ceb079e161",
+        "rev": "7ca821aada8b6fd82a5c422cd1eb821eb208f8ae",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 5822811..a9dfc68 100644
--- a/flake.nix
+++ b/flake.nix
@@ -109,6 +109,9 @@
             pkgs.openssl
             pkgs.pkg-config
           ];
+
+          DYLINT_DRIVER_PATH = dylint.passthru.DYLINT_DRIVER_PATH;
+          RUSTUP_TOOLCHAIN = toolchain;
         };
       }
     );
diff --git a/lints/dashmap-ref/Cargo.toml b/lints/dashmap-ref/Cargo.toml
index 70c7ba3..097ce72 100644
--- a/lints/dashmap-ref/Cargo.toml
+++ b/lints/dashmap-ref/Cargo.toml
@@ -7,12 +7,17 @@ publish = false
 [lib]
 crate-type = ["cdylib"]
 
+[[example]]
+name = "ui"
+path = "ui/main.rs"
+
 [dependencies]
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "19e305bb57a7595f2a8d81f521c0dd8bf854e739" }
 dylint_linting = "4.0.0"
 hakari = { version = "0.1", path = "../../hakari" }
 
 [dev-dependencies]
+dashmap = "6"
 dylint_testing = "4.0.0"
 
 [package.metadata.rust-analyzer]
diff --git a/lints/dashmap-ref/src/lib.rs b/lints/dashmap-ref/src/lib.rs
index fce89f0..eafcde4 100644
--- a/lints/dashmap-ref/src/lib.rs
+++ b/lints/dashmap-ref/src/lib.rs
@@ -1,31 +1,29 @@
 #![feature(rustc_private)]
 #![feature(let_chains)]
-#![warn(unused_extern_crates)]
 
-extern crate rustc_arena;
-extern crate rustc_ast;
-extern crate rustc_ast_pretty;
-extern crate rustc_data_structures;
-extern crate rustc_errors;
 extern crate rustc_hir;
-extern crate rustc_hir_pretty;
-extern crate rustc_index;
-extern crate rustc_infer;
-extern crate rustc_lexer;
 extern crate rustc_middle;
-extern crate rustc_mir_dataflow;
-extern crate rustc_parse;
 extern crate rustc_span;
-extern crate rustc_target;
-extern crate rustc_trait_selection;
 
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::match_any_def_paths;
+use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
+use rustc_lint::LateContext;
 use rustc_lint::LateLintPass;
+use rustc_middle::mir::CoroutineLayout;
+use rustc_middle::ty::Adt;
+use rustc_middle::ty::Ty;
+use rustc_span::sym;
 
 dylint_linting::declare_late_lint! {
     /// ### What it does
+    /// Check whether a DashMap reference is held across an await point.
     ///
     /// ### Why is this bad?
     ///
+    /// This can cause issues as the dashmap may deadlock
+    ///
     /// ### Known problems
     ///
     /// Remove if none.
@@ -43,15 +41,102 @@ dylint_linting::declare_late_lint! {
     /// ```
     pub DASHMAP_REF,
     Warn,
-    "description goes here"
+    "Check whether a dashmap reference is held over an await point"
 }
 
-impl<'tcx> LateLintPass<'tcx> for DashmapRef {
-    // A list of things you might check can be found here:
-    // https://doc.rust-lang.org/stable/nightly-rustc/rustc_lint/trait.LateLintPass.html
+const DASHMAP_REF_GUARD: [&str; 4] = ["dashmap", "mapref", "one", "Ref"];
+const DASHMAP_REF_MUT_GUARD: [&str; 4] = ["dashmap", "mapref", "one", "RefMut"];
+const DASHMAP_ENTRY_GUARD: [&str; 4] = ["dashmap", "mapref", "entry", "Entry"];
+const DASHMAP_ITER: [&str; 3] = ["dashmap", "iter", "Iter"];
+const DASHMAP_ITER_MUT: [&str; 3] = ["dashmap", "iter", "IterMut"];
+
+impl LateLintPass<'_> for DashmapRef {
+    fn check_expr(&mut self, cx: &LateContext<'_>, expr: &'_ hir::Expr<'_>) {
+        if let hir::ExprKind::Closure(hir::Closure {
+            def_id,
+            kind:
+                hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(
+                    hir::CoroutineDesugaring::Async,
+                    _,
+                )),
+            ..
+        }) = expr.kind
+        {
+            if let Some(coroutine_layout) = cx.tcx.mir_coroutine_witnesses(*def_id) {
+                check_interior_types(cx, coroutine_layout);
+            }
+        }
+    }
+}
+
+fn check_interior_types(cx: &LateContext<'_>, coroutine: &CoroutineLayout<'_>) {
+    for (ty_index, ty_cause) in coroutine.field_tys.iter_enumerated() {
+        if let Adt(adt, _) = ty_cause.ty.kind() {
+            let await_points = || {
+                coroutine
+                    .variant_source_info
+                    .iter_enumerated()
+                    .filter_map(|(variant, source_info)| {
+                        coroutine.variant_fields[variant]
+                            .raw
+                            .contains(&ty_index)
+                            .then_some(source_info.span)
+                    })
+                    .collect::<Vec<_>>()
+            };
+
+            if is_dashmap_ref(cx, adt.did(), &ty_cause.ty) {
+                span_lint_and_then(
+                    cx,
+                    DASHMAP_REF,
+                    ty_cause.source_info.span,
+                    "this dashmap reference is held \
+                    across an 'await' point. Either drop it before the 'await', \
+                    or read it again afterwards.",
+                    |diag| {
+                        diag.span_note(
+                            await_points(),
+                            "these are all the await points this ref is held through",
+                        );
+                    },
+                );
+            }
+        }
+    }
+}
+
+fn is_dashmap_ref(cx: &LateContext<'_>, def_id: DefId, ty: &Ty<'_>) -> bool {
+    if let Adt(adt, args) = ty.kind() {
+        if let Some(ty) = cx
+            .tcx
+            .is_diagnostic_item(sym::Option, adt.did())
+            .then(|| args.type_at(0))
+        {
+            if let Adt(adt, ..) = ty.kind() {
+                is_dashmap_ref(cx, adt.did(), &ty)
+            } else {
+                false
+            }
+        } else {
+            match_any_def_paths(
+                cx,
+                def_id,
+                &[
+                    &DASHMAP_REF_GUARD,
+                    &DASHMAP_REF_MUT_GUARD,
+                    &DASHMAP_ENTRY_GUARD,
+                    &DASHMAP_ITER,
+                    &DASHMAP_ITER_MUT,
+                ],
+            )
+            .is_some()
+        }
+    } else {
+        false
+    }
 }
 
 #[test]
 fn ui() {
-    dylint_testing::ui_test(env!("CARGO_PKG_NAME"), "ui");
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "ui");
 }
diff --git a/lints/dashmap-ref/ui/main.rs b/lints/dashmap-ref/ui/main.rs
index f328e4d..87ff771 100644
--- a/lints/dashmap-ref/ui/main.rs
+++ b/lints/dashmap-ref/ui/main.rs
@@ -1 +1,50 @@
-fn main() {}
+#[expect(unused_must_use)]
+fn main() {
+    held_across();
+    held_across_multiple();
+    dropped_before();
+    all_kinds();
+}
+
+async fn held_across() {
+    let map = dashmap::DashMap::<String, String>::default();
+
+    let reference = map.get("Hello");
+
+    std::future::pending::<()>().await;
+
+    println!("{reference:?}");
+}
+
+async fn held_across_multiple() {
+    let map = dashmap::DashMap::<String, String>::default();
+
+    let _reference = map.get("Hello");
+
+    std::future::pending::<()>().await;
+
+    std::future::pending::<()>().await;
+}
+
+async fn dropped_before() {
+    let map = dashmap::DashMap::<String, String>::default();
+
+    let _ = map.get("Hello");
+
+    std::future::pending::<()>().await;
+}
+
+async fn all_kinds() {
+    let map = dashmap::DashMap::<String, String>::default();
+
+    let _ref = map.get("Hello");
+    let _ref_mut = map.get_mut("Hello");
+    let _entry = map.entry("Hello".to_string());
+    let _opt_entry = map.try_entry("Hello".to_string());
+    let _iter_entry = map.iter();
+    let _iter_mut_entry = map.iter_mut();
+    let _direct_ref = map.get("Hello").unwrap();
+    let _direct_ref_mut = map.get_mut("Hello").unwrap();
+
+    std::future::pending::<()>().await;
+}
diff --git a/lints/dashmap-ref/ui/main.stderr b/lints/dashmap-ref/ui/main.stderr
index e69de29..2e3b566 100644
--- a/lints/dashmap-ref/ui/main.stderr
+++ b/lints/dashmap-ref/ui/main.stderr
@@ -0,0 +1,126 @@
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:12:9
+   |
+LL |     let reference = map.get("Hello");
+   |         ^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:14:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+   = note: `#[warn(dashmap_ref)]` on by default
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:22:9
+   |
+LL |     let _reference = map.get("Hello");
+   |         ^^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:24:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+LL |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:40:9
+   |
+LL |     let _ref = map.get("Hello");
+   |         ^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:41:9
+   |
+LL |     let _ref_mut = map.get_mut("Hello");
+   |         ^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:42:9
+   |
+LL |     let _entry = map.entry("Hello".to_string());
+   |         ^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:43:9
+   |
+LL |     let _opt_entry = map.try_entry("Hello".to_string());
+   |         ^^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:44:9
+   |
+LL |     let _iter_entry = map.iter();
+   |         ^^^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:45:9
+   |
+LL |     let _iter_mut_entry = map.iter_mut();
+   |         ^^^^^^^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:46:9
+   |
+LL |     let _direct_ref = map.get("Hello").unwrap();
+   |         ^^^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: this dashmap reference is held across an 'await' point. Either drop it before the 'await', or read it again afterwards.
+  --> $DIR/main.rs:47:9
+   |
+LL |     let _direct_ref_mut = map.get_mut("Hello").unwrap();
+   |         ^^^^^^^^^^^^^^^
+   |
+note: these are all the await points this ref is held through
+  --> $DIR/main.rs:49:34
+   |
+LL |     std::future::pending::<()>().await;
+   |                                  ^^^^^
+
+warning: 10 warnings emitted
+