Add crash implementation to document compiler bug

crash-me.roc

@@ -0,0 +1,23 @@
+app "crash-me"
+    packages { pf: "https://github.com/roc-lang/basic-cli/releases/download/0.7.1/Icc3xJoIixF3hCcfXrDwLCu4wQHtNdPyoJkEbkgIElA.tar.br" }
+    imports [pf.Stdout]
+    provides [main] to pf
+
+main =
+    fn1 = bind Num.sub 2
+    fn2 = compose fn1 fn1
+
+    results =
+        [fn1, fn2]
+        |> List.map \f -> f 2
+        |> List.map Num.toStr
+        |> Str.joinWith "\n"
+    Stdout.line "$(results)"
+
+bind : (a, b -> c), a -> (b -> c)
+bind = \fn, a ->
+    \b -> fn a b
+
+compose : (a -> b), (b -> c) -> (a -> c)
+compose = \fn1, fn2 ->
+    \a -> fn1 a |> fn2

higher-order.roc

@@ -5,13 +5,24 @@ app "higher-order"
 
 main : Task.Task {} I32
 main =
-    mySum = bind anySum 2
+    fn1 = bind Num.sub 3
-    Stdout.line "$(Num.toStr (mySum 2))"
+    fn2 = bindL Num.sub 3
+    fn3 = compose fn2 fn1
+    results =
+        [fn1 2, fn2 2, fn3 2]
+        |> List.map Num.toStr
+        |> List.mapWithIndex \e, idx -> "fn$(Num.toStr idx) -> $(e)"
+        |> Str.joinWith "\n"
+    Stdout.line "$(results)"
 
 bind : (a, b -> c), a -> (b -> c)
 bind = \fn, a ->
     \b -> fn a b
 
-anySum : Num a, Num a -> Num a
+bindL : (a, b -> c), b -> (a -> c)
-anySum = \a, b ->
+bindL = \fn, b ->
-    a + b + 2
+    \a -> fn a b
+
+compose : (a -> b), (b -> c) -> (a -> c)
+compose = \fn1, fn2 ->
+    \a -> fn1 a |> fn2