Document opaque types

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

1 files changed, 7 insertions, 0 deletions

diff --git a/src/content/chapter5_advanced_features/lesson03_todo/code.gleam b/src/content/chapter5_advanced_features/lesson03_todo/code.gleam
new file mode 100644
index 0000000..d5abe8f
--- /dev/null
+++ b/src/content/chapter5_advanced_features/lesson03_todo/code.gleam
@@ -0,0 +1,7 @@
+pub fn main() {
+  todo as "I haven't written this code yet!"
+}
+
+pub fn todo_without_reason() {
+  todo
+}