Added Use Cases for Elixir

.formatter.exs

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+# SPDX-FileCopyrightText: 2012 Plataformatec
+
+[
+  inputs: [
+    "lib/*/{lib,scripts,unicode,test}/**/*.{ex,exs}",
+    "lib/*/*.exs",
+    "lib/ex_unit/examples/*.exs",
+    ".formatter.exs"
+  ],
+  locals_without_parens: [
+    # Formatter tests
+    assert_format: 2,
+    assert_format: 3,
+    assert_same: 1,
+    assert_same: 2,
+
+    # Errors tests
+    assert_eval_raise: 3,
+
+    # Float tests
+    float_assert: 1
+  ]
+]

.gitattributes

@@ -1 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+# SPDX-FileCopyrightText: 2012 Plataformatec
+
 lib/elixir/test/elixir/fixtures/*.txt text eol=lf
+*.ex diff=elixir
+*.exs diff=elixir

.github/ISSUE_TEMPLATE/config.yml

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+
+---
+blank_issues_enabled: true
+
+contact_links:
+  - name: Ask questions, support, and general discussions
+    url: https://elixirforum.com/
+    about: Ask questions, provide support, and more on Elixir Forum
+
+  - name: Propose new features
+    url: https://github.com/elixir-lang/elixir/#proposing-new-features
+    about: Propose new features in our mailing list

.github/ISSUE_TEMPLATE/issue.yml

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+
+---
+name: Report an issue
+description:
+  Tell us about something that is not working the way we (probably) intend
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thank you for contributing to Elixir! :heart:
+
+
+        Please, do not use this form for guidance, questions or support.
+        Try instead in [Elixir Forum](https://elixirforum.com),
+        the [IRC Chat](https://web.libera.chat/#elixir),
+        [Stack Overflow](https://stackoverflow.com/questions/tagged/elixir),
+        [Slack](https://elixir-slackin.herokuapp.com),
+        [Discord](https://discord.gg/elixir) or in other online communities.
+
+  - type: textarea
+    id: elixir-and-otp-version
+    attributes:
+      label: Elixir and Erlang/OTP versions
+      description: Paste the output of `elixir --version` here.
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      description: The operating system that this issue is happening on.
+    validations:
+      required: true
+
+  - type: textarea
+    id: current-behavior
+    attributes:
+      label: Current behavior
+      description: >
+        Include code samples, errors, and stacktraces if appropriate.
+
+
+        If reporting a bug, please include the reproducing steps.
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: A short description on how you expect the code to behave.
+    validations:
+      required: true

.github/dependabot.yml

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7

.github/workflows/ci.yml

@@ -0,0 +1,157 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+# SPDX-FileCopyrightText: 2012 Plataformatec
+
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+env:
+  ELIXIR_ASSERT_TIMEOUT: 2000
+  ELIXIRC_OPTS: "--warnings-as-errors"
+  LANG: C.UTF-8
+
+permissions:
+  contents: read
+
+jobs:
+  test_linux:
+    name: Ubuntu 24.04, OTP ${{ matrix.otp_version }}${{ matrix.deterministic && ' (deterministic)' || '' }}${{ matrix.coverage && ' (coverage)' || '' }}
+    runs-on: ubuntu-24.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - otp_version: "28.1"
+            deterministic: true
+          - otp_version: "28.1"
+            erlc_opts: "warnings_as_errors"
+            docs: true
+            coverage: true
+          - otp_version: "27.3"
+            erlc_opts: "warnings_as_errors"
+          - otp_version: "27.0"
+            erlc_opts: "warnings_as_errors"
+          - otp_version: "26.0"
+          - otp_version: master
+            development: true
+          - otp_version: maint
+            development: true
+
+    # Earlier Erlang/OTP versions ignored compiler directives
+    # when using warnings_as_errors. So we only set ERLC_OPTS
+    # from Erlang/OTP 27+.
+    env:
+      ERLC_OPTS: ${{ matrix.erlc_opts || '' }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.20.4
+        with:
+          otp-version: ${{ matrix.otp_version }}
+
+      - name: Set ERL_COMPILER_OPTIONS
+        if: ${{ matrix.deterministic }}
+        run: echo "ERL_COMPILER_OPTIONS=deterministic" >> $GITHUB_ENV
+
+      - name: Compile Elixir
+        run: |
+          make compile
+          echo "$PWD/bin" >> $GITHUB_PATH
+
+      - name: Build info
+        run: bin/elixir --version
+
+      - name: Check format
+        run: make test_formatted && echo "All Elixir source code files are properly formatted."
+
+      - name: Erlang test suite
+        run: make test_erlang
+        continue-on-error: ${{ matrix.development == true }}
+
+      - name: Elixir test suite
+        run: make test_elixir
+        continue-on-error: ${{ matrix.development == true }}
+        env:
+          COVER: "${{ matrix.coverage }}"
+
+      - name: Build docs (ExDoc main)
+        if: ${{ matrix.docs }}
+        run: |
+          cd ..
+          git clone https://github.com/elixir-lang/ex_doc.git --depth 1
+          cd ex_doc
+          ../elixir/bin/mix do local.rebar --force + local.hex --force + deps.get + compile
+          cd ../elixir/
+          git fetch --tags
+          DOCS_OPTIONS="--warnings-as-errors" make docs
+
+      - name: "Calculate Coverage"
+        if: ${{ matrix.coverage }}
+        run: make cover | tee "$GITHUB_STEP_SUMMARY"
+
+      - name: "Upload Coverage Artifact"
+        if: ${{ matrix.coverage }}
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: TestCoverage
+          path: cover/*
+
+      - name: Check reproducible builds
+        if: ${{ matrix.deterministic }}
+        run: taskset 1 make check_reproducible
+
+      - name: Check git is not required
+        if: ${{ matrix.deterministic }}
+        run: |
+          rm -rf .git
+          cd lib/elixir
+          elixirc --ignore-module-conflict -o ebin "lib/**/*.ex"
+
+  test_windows:
+    name: Windows Server 2022, OTP ${{ matrix.otp_version }}
+    runs-on: windows-2022
+
+    strategy:
+      matrix:
+        otp_version:
+          - "28.1"
+          - "27.3"
+          - "26.2"
+
+    steps:
+      - name: Configure Git
+        run: git config --global core.autocrlf input
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.20.4
+        with:
+          otp-version: ${{ matrix.otp_version }}
+
+      - name: Compile Elixir
+        run: |
+          Remove-Item -Recurse -Force '.git'
+          make compile
+
+      - name: Build info
+        run: bin/elixir --version
+
+      - name: Check format
+        run: make test_formatted && echo "All Elixir source code files are properly formatted."
+
+      - name: Erlang test suite
+        run: make test_erlang
+
+      - name: Elixir test suite
+        run: |
+          Remove-Item 'c:/Windows/System32/drivers/etc/hosts'
+          make test_elixir

.github/workflows/codeql.yml

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2026 The Elixir Team
+
+name: "CodeQL Advanced"
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  schedule:
+    - cron: "29 8 * * 1"
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: "ubuntu-latest"
+    permissions:
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: actions
+            build-mode: none
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@89a39a4e59826350b863aa6b6252a07ad50cf83e # v4.32.4
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: ${{ matrix.build-mode }}
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@89a39a4e59826350b863aa6b6252a07ad50cf83e # v4.32.4
+        with:
+          category: "/language:${{matrix.language}}"
+
+  zizmor:
+    name: Zizmor
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@0dce2577a4760a2749d8cfb7a84b7d5585ebcb7d # v0.5.0

.github/workflows/license_compliance.yml

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: 2021 The Elixir Team
+
+name: License Compliance
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  LANG: C.UTF-8
+
+jobs:
+  license_compliance:
+    name: Check License Compliance
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Use HTTPS instead of SSH for Git cloning
+        id: git-config
+        shell: bash
+        run: git config --global url.https://github.com/.insteadOf ssh://git@github.com/
+
+      - name: Checkout project
+        id: checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Run OSS Review Toolkit
+        id: ort
+        uses: ./.github/workflows/ort
+        with:
+          upload-reports: true
+          fail-on-violation: true
+          report-formats: "WebApp"
+          version: "${{ github.sha }}"