From 73c857415eafc1d0856b6917cada94d8acde41e0 Mon Sep 17 00:00:00 2001
From: John Schmidt <john.schmidt.h@gmail.com>
Date: Sat, 4 Feb 2023 18:28:36 +0100
Subject: [PATCH] std.json: fix parsing of structs with default value const
 pointers

---
 lib/std/json.zig      | 2 +-
 lib/std/json/test.zig | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/std/json.zig b/lib/std/json.zig
index 92afeead90..41bfb30bc5 100644
--- a/lib/std/json.zig
+++ b/lib/std/json.zig
@@ -1639,7 +1639,7 @@ fn parseInternal(
             const allocator = options.allocator orelse return error.AllocatorRequired;
             switch (ptrInfo.size) {
                 .One => {
-                    const r: T = try allocator.create(ptrInfo.child);
+                    const r: *ptrInfo.child = try allocator.create(ptrInfo.child);
                     errdefer allocator.destroy(r);
                     r.* = try parseInternal(ptrInfo.child, token, tokens, options);
                     return r;
diff --git a/lib/std/json/test.zig b/lib/std/json/test.zig
index 0bf0797587..70385acfb5 100644
--- a/lib/std/json/test.zig
+++ b/lib/std/json/test.zig
@@ -2238,6 +2238,14 @@ test "parse into struct with no fields" {
     try testing.expectEqual(T{}, try parse(T, &ts, ParseOptions{}));
 }
 
+const test_const_value: usize = 123;
+
+test "parse into struct with default const pointer field" {
+    const T = struct { a: *const usize = &test_const_value };
+    var ts = TokenStream.init("{}");
+    try testing.expectEqual(T{}, try parse(T, &ts, .{}));
+}
+
 test "parse into struct where destination and source lengths mismatch" {
     const T = struct { a: [2]u8 };
     var ts = TokenStream.init("{\"a\": \"bbb\"}");