Document opaque types

Closes https://github.com/gleam-lang/language-tour/issues/63

2 files changed, 0 insertions, 31 deletions

diff --git a/src/content/chapter5_advanced_features/lesson07_external_gleam_fallbacks/code.gleam b/src/content/chapter5_advanced_features/lesson07_external_gleam_fallbacks/code.gleam
deleted file mode 100644
index a97b8fc..0000000
--- a/src/content/chapter5_advanced_features/lesson07_external_gleam_fallbacks/code.gleam
+++ /dev/null
@@ -1,18 +0,0 @@
-import gleam/io
-
-@external(erlang, "lists", "reverse")
-pub fn reverse_list(items: List(e)) -> List(e) {
-  tail_recursive_reverse(items, [])
-}
-
-fn tail_recursive_reverse(items: List(e), reversed: List(e)) -> List(e) {
-  case items {
-    [] -> reversed
-    [first, ..rest] -> tail_recursive_reverse(rest, [first, ..reversed])
-  }
-}
-
-pub fn main() {
-  io.debug(reverse_list([1, 2, 3, 4, 5]))
-  io.debug(reverse_list(["a", "b", "c", "d", "e"]))
-}
diff --git a/src/content/chapter5_advanced_features/lesson07_external_gleam_fallbacks/en.html b/src/content/chapter5_advanced_features/lesson07_external_gleam_fallbacks/en.html
deleted file mode 100644
index 243c7ea..0000000
--- a/src/content/chapter5_advanced_features/lesson07_external_gleam_fallbacks/en.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<p>
-  It's possible for a function to have both a Gleam implementation and an
-  external implementation. If there exists an external implementation for the
-  currently compiled-for target then it will be used, otherwise the Gleam
-  implementation is used.
-</p>
-<p>
-  This may be useful if you have a function that can be implemented in Gleam,
-  but there is an optimised implementation that can be used for one target. For
-  example, the Erlang virtual machine has a built-in list reverse function that
-  is implemented in native code. The code here uses this implementation when
-  running on Erlang, as it is then available.
-</p>