From 86074a9e4c0833e35e54ba5c7d00e30cd3205437 Mon Sep 17 00:00:00 2001
From: Simon Ochsenreither <simon@ochsenreither.de>
Date: Mon, 18 Dec 2023 16:58:22 +0100
Subject: [PATCH] stdlib: add missing `Identity` blanket impl for `Option` and
 `Result`

works on #88
---
 dora/stdlib/primitives.dora | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/dora/stdlib/primitives.dora b/dora/stdlib/primitives.dora
index d72dd998..e96a0166 100644
--- a/dora/stdlib/primitives.dora
+++ b/dora/stdlib/primitives.dora
@@ -1,4 +1,4 @@
-use std.traits.{Default, Equals, Hash, Iterator, Zero};
+use std.traits.{Default, Equals, Hash, Identity, Iterator, Zero};
 use std.string.Stringable;
 use std.fatalError;
 
@@ -510,6 +510,10 @@ impl[T] Option[Option[T]] {
     ... is None      { None[T] };
 }
 
+impl[T: Identity] Identity for Option[T] {
+  @pub fun identicalTo(rhs: Option[T]): Bool = self === rhs;
+}
+
 impl[T: Equals] Equals for Option[T] {
   @pub fun equals(rhs: Option[T]): Bool {
     if self.isSome() {
@@ -626,6 +630,10 @@ impl[T, E] Result[T, E] {
     ... is Err(_)  { None[T] };
 }
 
+impl[T: Identity, E] Identity for Result[T, E] {
+  @pub fun identicalTo(rhs: Result[T, E]): Bool = self === rhs;
+}
+
 impl[T: Equals, E] Result[T, E] {
   @pub fun contains(rhs: T): Bool = if self
     ... is Ok(val) { val.equals(rhs) }