From 094cf5f6d6f9dac61806f883d3677d357d3a7f38 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Sat, 18 Apr 2020 22:00:09 +0100
Subject: Show how to label arguments of external functions

---
 src/gleam/list.gleam | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/gleam/list.gleam b/src/gleam/list.gleam
index fbc3ab5..271ef3b 100644
--- a/src/gleam/list.gleam
+++ b/src/gleam/list.gleam
@@ -12,7 +12,7 @@ pub type LengthMismatch {
 
 /// Using the Erlang C BIF implementation.
 ///
-pub external fn length(List(a)) -> Int = "erlang" "length"
+pub external fn length(of: List(a)) -> Int = "erlang" "length"
 
 /// Using the Erlang C BIF implementation.
 ///
@@ -230,7 +230,7 @@ pub fn zip(xs: List(a), ys: List(b)) -> List(tuple(a, b)) {
 }
 
 pub fn strict_zip(l1: List(a), l2: List(b)) -> Result(List(tuple(a, b)), LengthMismatch) {
-  case length(l1) == length(l2) {
+  case length(of: l1) == length(of: l2) {
     True -> Ok(zip(l1, l2))
     False -> Error(LengthMismatch)
   }
-- 
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