From 4018034708beea63086a34d361ffb400979a1189 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sun, 24 Nov 2019 16:52:32 -0500
Subject: [PATCH] add test cases for arbitrary pointer sentinels

---
 test/stage1/behavior/pointers.zig | 48 +++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/test/stage1/behavior/pointers.zig b/test/stage1/behavior/pointers.zig
index 8cf7611269..89c6b29871 100644
--- a/test/stage1/behavior/pointers.zig
+++ b/test/stage1/behavior/pointers.zig
@@ -213,3 +213,51 @@ test "null terminated pointer" {
     S.doTheTest();
     comptime S.doTheTest();
 }
+
+test "allow any sentinel" {
+    const S = struct {
+        fn doTheTest() void {
+            var array = [_:std.math.minInt(i32)]i32{1, 2, 3, 4};
+            var ptr: [*:std.math.minInt(i32)]i32 = &array;
+            expect(ptr[4] == std.math.minInt(i32));
+        }
+    };
+    S.doTheTest();
+    comptime S.doTheTest();
+}
+
+test "pointer sentinel with enums" {
+    const S = struct {
+        const Number = enum{one, two, sentinel};
+
+        fn doTheTest() void {
+            var ptr: [*:.sentinel]Number = &[_:.sentinel]Number{.one, .two, .two, .one};
+            expect(ptr[4] == .sentinel); // TODO this should be comptime expect, see #3731
+        }
+    };
+    S.doTheTest();
+    comptime S.doTheTest();
+}
+
+test "pointer sentinel with optional element" {
+    const S = struct {
+        fn doTheTest() void {
+            var ptr: [*:null]?i32 = &[_:null]?i32{1, 2, 3, 4};
+            expect(ptr[4] == null); // TODO this should be comptime expect, see #3731
+        }
+    };
+    S.doTheTest();
+    comptime S.doTheTest();
+}
+
+test "pointer sentinel with +inf" {
+    const S = struct {
+        fn doTheTest() void {
+            const inf = std.math.inf_f32;
+            var ptr: [*:inf]f32 = &[_:inf]f32{1.1, 2.2, 3.3, 4.4};
+            expect(ptr[4] == inf); // TODO this should be comptime expect, see #3731
+        }
+    };
+    S.doTheTest();
+    comptime S.doTheTest();
+}