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-rw-r--r--src/gleam/function.gleam2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/gleam/function.gleam b/src/gleam/function.gleam
index 007eded..1ee8d9c 100644
--- a/src/gleam/function.gleam
+++ b/src/gleam/function.gleam
@@ -63,7 +63,7 @@ pub fn constant(value: a) -> fn(b) -> a {
/// calls that function with that argument
/// and returns that argument instead of the function return value.
/// Useful for running synchronous side effects in a pipeline.
-pub fn tap (arg, effect: fn (a) -> b) -> a {
+pub fn tap (arg: a, effect: fn (a) -> b) -> a {
effect(arg)
arg
}