diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000000..ae36a7d7a73
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Force git not to modify line endings for go files
+*.go binary
+
+# Force git not to modify line endings for dbschemes
+*.dbscheme binary
diff --git a/.github/workflows/codeqltest.yml b/.github/workflows/codeqltest.yml
new file mode 100644
index 00000000000..e463867c00e
--- /dev/null
+++ b/.github/workflows/codeqltest.yml
@@ -0,0 +1,70 @@
+name: CodeQL tests
+on: [pull_request]
+jobs:
+
+  test-linux:
+    name: Test Linux (Ubuntu)
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.13.3
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13.3
+      id: go
+
+    - name: Set up CodeQL CLI
+      uses: Anthophila/codeql-action/setup-codeql@master
+
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Build
+      run: make
+
+    - name: Test
+      run: make test
+
+  test-mac:
+    name: Test MacOS
+    runs-on: macOS-latest
+    steps:
+    - name: Set up Go 1.13.3
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13.3
+      id: go
+
+    - name: Set up CodeQL CLI
+      uses: Anthophila/codeql-action/setup-codeql@master
+
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Build
+      run: make
+
+    - name: Test
+      run: make test
+
+  test-win:
+    name: Test Windows
+    runs-on: windows-latest
+    steps:
+    - name: Set up Go 1.13.3
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13.3
+      id: go
+
+    - name: Set up CodeQL CLI
+      uses: Anthophila/codeql-action/setup-codeql@master
+
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Build
+      run: make
+
+    - name: Test
+      run: make test
diff --git a/ql/examples/snippets/variable.ql b/ql/examples/snippets/variable.ql
index c6587103368..28bb4934544 100644
--- a/ql/examples/snippets/variable.ql
+++ b/ql/examples/snippets/variable.ql
@@ -10,4 +10,4 @@ import go
 
 from Variable err
 where err.getName() = "err"
-select err
+select err, err.getDeclaration()
diff --git a/ql/test/example-tests/snippets/variable.expected b/ql/test/example-tests/snippets/variable.expected
index 8f51749125b..64934db25a0 100644
--- a/ql/test/example-tests/snippets/variable.expected
+++ b/ql/test/example-tests/snippets/variable.expected
@@ -1,47 +1 @@
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| file://:0:0:0:0 | err |
-| main.go:29:2:29:4 | err |
+| main.go:29:2:29:4 | err | main.go:29:2:29:4 | err |