Document opaque types

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

1 files changed, 0 insertions, 16 deletions

diff --git a/src/content/chapter5_advanced_features/lesson04_let_assert/code.gleam b/src/content/chapter5_advanced_features/lesson04_let_assert/code.gleam
deleted file mode 100644
index 2ba907a..0000000
--- a/src/content/chapter5_advanced_features/lesson04_let_assert/code.gleam
+++ /dev/null
@@ -1,16 +0,0 @@
-import gleam/io
-
-pub fn main() {
-  let a = unsafely_get_first_element([123])
-  io.debug(a)
-
-  let b = unsafely_get_first_element([])
-  io.debug(b)
-}
-
-pub fn unsafely_get_first_element(items: List(a)) -> a {
-  // This will panic if the list is empty.
-  // A regular `let` would not permit this partial pattern
-  let assert [first, ..] = items
-  first
-}