diff --git a/.github/workflows/EverythingBuild.yml b/.github/workflows/EverythingBuild.yml
index 4fa0012da..074232068 100644
--- a/.github/workflows/EverythingBuild.yml
+++ b/.github/workflows/EverythingBuild.yml
@@ -37,3 +37,26 @@ jobs:
 
     - name: Build Utils
       run: dotnet build Sources/Utils/Utils/Utils.csproj
+
+    # The samples are the code most like what a user writes, and nothing built them
+    # until now. Two of them called integral(f, x, 1), which stopped parsing in 1.4.0,
+    # and stayed broken for seven months because no job compiled or ran them.
+    - name: Build samples
+      run: |
+        dotnet build Sources/Samples/SampleNet5/SampleNet5.csproj
+        dotnet build Sources/Samples/FSharpSample/FSharpSample.fsproj
+        dotnet build Sources/Samples/FSharpPlayground/FSharpPlayground.fsproj
+        dotnet build Sources/Samples/Samples/Playground.csproj
+        dotnet build Sources/Samples/InteractivePlayground/InteractivePlayground.fsproj
+        dotnet build Sources/Samples/AngouriMathPlot/AngouriMathPlot.csproj
+        dotnet build Sources/Samples/GraphicExample/GraphicExample.csproj
+
+    # Building is not enough: both samples that broke compiled cleanly and threw at
+    # runtime. Only the console ones can run here -- AngouriMathPlot and GraphicExample
+    # are windowed, and InteractivePlayground opens a browser through Plotly.
+    - name: Run console samples
+      run: |
+        dotnet run --project Sources/Samples/SampleNet5/SampleNet5.csproj --no-build
+        dotnet run --project Sources/Samples/FSharpSample/FSharpSample.fsproj --no-build
+        dotnet run --project Sources/Samples/FSharpPlayground/FSharpPlayground.fsproj --no-build
+        dotnet run --project Sources/Samples/Samples/Playground.csproj --no-build
diff --git a/Sources/Samples/FSharpPlayground/Program.fs b/Sources/Samples/FSharpPlayground/Program.fs
index c2ca30f4d..334a23abb 100644
--- a/Sources/Samples/FSharpPlayground/Program.fs
+++ b/Sources/Samples/FSharpPlayground/Program.fs
@@ -12,4 +12,4 @@ printfn "%O" (integral "x" "x2 + e")
 
 printfn "%O" (``lim x->0`` "sin(a x) / x")
 
-printfn "%O" (latex "x / e + alpha + sqrt(x) + integral(y + 3, y, 1)")
+printfn "%O" (latex "x / e + alpha + sqrt(x) + integral(y + 3, y)")