fix: final review findings

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -5,6 +5,10 @@ obj/
 .scala-build/
 .bsp/
 */web/dist/
+.bloop/
+.metals/
+.idea/
+.vscode/
 
 # build outputs
 .fable/

README.md

@@ -44,9 +44,9 @@ To play the game in any track you also need a modern browser. [Module 0](course/
 Run the tests (from the repository root):
 
 ```sh
-cd js && node --test "test/m03-*.test.js"   # JavaScript, one module   (all: ./test.sh)
+(cd js && node --test "test/m03-*.test.js")   # JavaScript, one module   (all: ./test.sh)
-cd scala && ./test.sh M03                     # Scala, one module        (all: ./test.sh)
+(cd scala && ./test.sh M03)                   # Scala, one module        (all: ./test.sh)
-cd fsharp && ./test.sh M03                    # F#, one module           (all: ./test.sh)
+(cd fsharp && ./test.sh M03)                  # F#, one module           (all: ./test.sh)
 ```
 
 In a fresh checkout, Module 0's tests pass and every other module's tests fail: the files in `src/` are stubs for you to fill in.

course/00-setup.md

@@ -189,6 +189,8 @@ cd fsharp
 ./test.sh                          # everything
 ```
 
+If `scala-cli` prints a hint that the munit dependency is outdated, ignore it: the course pins munit on purpose, for reproducibility.
+
 Try it now with Module 0, which has a few sanity tests that already pass. They check that your toolchain works and that the fixtures folder can be read. If you see three green tests (Scala and F#: a short summary with no failures), you are set up.
 
 ### What a red test means

course/06-rendering-as-data.md

@@ -195,7 +195,7 @@ Our `view : GameState → Scene` is exactly this, for a canvas instead of HTML.
 
 ## Exercises
 
-> **About test names.** The test titles quoted under "Proved by" are the JavaScript ones. The Scala and F# suites test the same things one-to-one, but their titles use each track's vocabulary: "events" instead of "inputs", `None` instead of `null`, `()` instead of `undefined`, `bind`/`choose` instead of `flatMap`/`filterMap`, `IO.map throwingF io` instead of `map(io, throwingF)`, and so on. Failing tests are reported by name when you run the module's tests; to read all titles, open `scala/test/M06View.test.scala` or `fsharp/tests/M06View.fs`. Fixture-based tests have the same case names in every track.
+> **About test names.** The test titles quoted under "Proved by" are the JavaScript ones, which carry an `m06` prefix (e.g. `m06 CELL is 20 pixels`). The Scala and F# suites test the same things one-to-one, without that prefix: `CELL is 20 pixels` is identical, and the fixture-driven cases appear as `view: <case name>` with the same case names in every track. Failing tests are reported by name when you run the module's tests; to read all titles, open `scala/test/M06View.test.scala` or `fsharp/tests/M06View.fs`.
 
 ### Exercise 6.1 — `view`
 

course/09-wiring-it-together.md

@@ -229,11 +229,11 @@ Remember section 12 of Module 7: the loop only helps if each continuation does a
 That's the whole runtime. Go back to the stateful code at the start of Module 8, with its `let state` and logic in callbacks, and compare. There, the mutable variable held the *game state*, and game logic lived in the callbacks. Here, the variable holds the *current stream* — the runtime doesn't even know there's a game. It has no idea what a snake, a tick or a score is. All the game logic is in pure values; the runtime is a few lines of plumbing. That is what "pushing effects to the edge" means in practice.
 
 ```
-                 ┌──────────────────────── runtime (impure, ~20 lines) ─────────────────────────┐
+                 ┌────────────────────────────── runtime (impure, ~20 lines) ─────────────────────────────────┐
- browser ──key──▶│ feed(KeyDown key):  [ios, next] = stream.step(ev); stream = next; ios.forEach(runIO) │──▶ canvas
+ browser ──key──▶│ feed(KeyDown key):  [ios, next] = stream.step(ev); stream = next; ios.forEach(runIO)       │
-         ──time─▶│ feed(Time t)                                                                  │
+         ──time─▶│ feed(Time t)                                                                               │
-                 └───────────────────────────────────────────────────────────────────────────────┘
+                 └────────────────────────────────────────────────────────────────────────────────────────────┘
-                                  ▲ the one `let` / `var` / ref cell: stream
+                 ▲ the one `let` / `var` / ref cell: stream
 ```
 
 The tests describe the behaviour precisely; read them before writing the code:

fsharp/tests/Purity.fs

@@ -29,7 +29,13 @@ let private violations (code: string) =
 
 let private fsFiles () =
     if Directory.Exists srcDir then
-        Directory.GetFiles(srcDir, "*.fs", SearchOption.AllDirectories) |> Array.sort |> List.ofArray
+        Directory.GetFiles(srcDir, "*.fs", SearchOption.AllDirectories)
+        |> Array.filter (fun f ->
+            // skip generated output: any path component named bin or obj
+            let rel = Path.GetRelativePath(srcDir, f)
+            not (rel.Split([| '/'; '\\' |]) |> Array.exists (fun d -> d = "bin" || d = "obj")))
+        |> Array.sort
+        |> List.ofArray
     else
         []
 

scripts/serve.mjs

@@ -27,4 +27,4 @@ createServer(async (req, res) => {
     res.writeHead(e.code === 'EACCES' ? 403 : 404, { 'content-type': 'text/plain' })
     res.end(e.code === 'EACCES' ? 'forbidden' : 'not found')
   }
-}).listen(port, () => console.log(`Serving ${root} on http://localhost:${port}`))
+}).listen(port, '127.0.0.1', () => console.log(`Serving ${root} on http://localhost:${port}`))