Add spec_lint CI gate

.github/workflows/ci.yml

@@ -213,3 +213,28 @@ jobs:
       - run: MIX_ENV=test mix format --check-formatted
       - run: cd apps/language_server && MIX_ENV=test mix format --check-formatted
       - run: mix dialyzer
+
+  spec_lint:
+    name: spec_lint
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v7
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: '29'
+          elixir-version: '1.20.4'
+      - name: Cache dependencies
+        uses: actions/cache@v6
+        with:
+          path: |
+            _build
+            deps
+          key: spec-lint-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            spec-lint-
+      - name: Install Dependencies
+        run: |
+          mix local.hex --force
+          mix local.rebar --force
+          mix deps.get
+      - run: mix spec_lint

mix.exs

@@ -26,7 +26,12 @@ defmodule ElixirLS.Mixfile do
   end
 
   defp deps do
-    []
+    # spec_lint requires Elixir ~> 1.18
+    if Version.match?(System.version(), ">= 1.18.0") do
+      [{:spec_lint, "~> 0.1", only: [:dev, :test], runtime: false}]
+    else
+      []
+    end
   end
 
   defp aliases do

mix.lock

@@ -10,6 +10,7 @@
   "patch": {:hex, :patch, "0.12.0", "2da8967d382bade20344a3e89d618bfba563b12d4ac93955468e830777f816b0", [:mix], [], "hexpm", "ffd0e9a7f2ad5054f37af84067ee88b1ad337308a1cb227e181e3967127b0235"},
   "path_glob_vendored": {:git, "https://github.com/elixir-lsp/path_glob.git", "965350dc41def7be4a70a23904195c733a2ecc84", [ref: "965350dc41def7be4a70a23904195c733a2ecc84"]},
   "schematic_v": {:git, "https://github.com/elixir-lsp/schematic_vendored.git", "7ecf3cd4b3ee319abf7d0914d325657a1f56cffd", [ref: "7ecf3cd4b3ee319abf7d0914d325657a1f56cffd"]},
+  "spec_lint": {:hex, :spec_lint, "0.1.1", "e40649140dc96a32a2d4a7b98e8fbd3035d138b87154a35716f2cca76955cdae", [:mix], [], "hexpm", "67d7cc8d2e2cb29595518ee042b470a71de619ca250440e526c7987e06adeada"},
   "statistex": {:hex, :statistex, "1.0.0", "f3dc93f3c0c6c92e5f291704cf62b99b553253d7969e9a5fa713e5481cd858a5", [:mix], [], "hexpm", "ff9d8bee7035028ab4742ff52fc80a2aa35cece833cf5319009b52f1b5a86c27"},
   "stream_data": {:hex, :stream_data, "0.5.0", "b27641e58941685c75b353577dc602c9d2c12292dd84babf506c2033cd97893e", [:mix], [], "hexpm", "012bd2eec069ada4db3411f9115ccafa38540a3c78c4c0349f151fc761b9e271"},
   "toxic2": {:git, "https://github.com/lukaszsamson/toxic2.git", "c47c911dac5aafa860206d222a781c3d71afc843", [ref: "c47c911dac5aafa860206d222a781c3d71afc843"]},