diff --git a/lib/std/hash_map.zig b/lib/std/hash_map.zig
index 66d67bf08d..8a29741d9e 100644
--- a/lib/std/hash_map.zig
+++ b/lib/std/hash_map.zig
@@ -738,7 +738,7 @@ pub fn HashMapUnmanaged(
             value: V,
         };
 
-        const Header = packed struct {
+        const Header = struct {
             values: [*]V,
             keys: [*]K,
             capacity: Size,
@@ -932,7 +932,7 @@ pub fn HashMapUnmanaged(
         }
 
         fn header(self: *const Self) *Header {
-            return @ptrCast(*Header, @ptrCast([*]Header, self.metadata.?) - 1);
+            return @ptrCast(*Header, @ptrCast([*]Header, @alignCast(@alignOf(Header), self.metadata.?)) - 1);
         }
 
         fn keys(self: *const Self) [*]K {
diff --git a/lib/std/heap/general_purpose_allocator.zig b/lib/std/heap/general_purpose_allocator.zig
index dfef8016d5..87c762fac1 100644
--- a/lib/std/heap/general_purpose_allocator.zig
+++ b/lib/std/heap/general_purpose_allocator.zig
@@ -341,9 +341,15 @@ pub fn GeneralPurposeAllocator(comptime config: Config) type {
                             const slot_index = @intCast(SlotIndex, used_bits_byte * 8 + bit_index);
                             const stack_trace = bucketStackTrace(bucket, size_class, slot_index, .alloc);
                             const addr = bucket.page + slot_index * size_class;
-                            log.err("memory address 0x{x} leaked: {s}", .{
-                                @ptrToInt(addr), stack_trace,
-                            });
+                            if (builtin.zig_backend == .stage1) {
+                                log.err("memory address 0x{x} leaked: {s}", .{
+                                    @ptrToInt(addr), stack_trace,
+                                });
+                            } else { // TODO
+                                log.err("memory address 0x{x} leaked", .{
+                                    @ptrToInt(addr),
+                                });
+                            }
                             leaks = true;
                         }
                         if (bit_index == math.maxInt(u3))
@@ -372,9 +378,16 @@ pub fn GeneralPurposeAllocator(comptime config: Config) type {
             var it = self.large_allocations.valueIterator();
             while (it.next()) |large_alloc| {
                 if (config.retain_metadata and large_alloc.freed) continue;
-                log.err("memory address 0x{x} leaked: {s}", .{
-                    @ptrToInt(large_alloc.bytes.ptr), large_alloc.getStackTrace(.alloc),
-                });
+                const stack_trace = large_alloc.getStackTrace(.alloc);
+                if (builtin.zig_backend == .stage1) {
+                    log.err("memory address 0x{x} leaked: {s}", .{
+                        @ptrToInt(large_alloc.bytes.ptr), stack_trace,
+                    });
+                } else { // TODO
+                    log.err("memory address 0x{x} leaked", .{
+                        @ptrToInt(large_alloc.bytes.ptr),
+                    });
+                }
                 leaks = true;
             }
             return leaks;
diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index 91e402e533..0d90bbfeaa 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -46,9 +46,10 @@ pub fn main() void {
 
     var leaks: usize = 0;
     for (test_fn_list) |test_fn, i| {
-        if (builtin.zig_backend != .stage2_llvm) std.testing.allocator_instance = .{};
+        const gpa_works = builtin.zig_backend == .stage1 or builtin.os.tag != .macos;
+        if (gpa_works) std.testing.allocator_instance = .{};
         defer {
-            if (builtin.zig_backend != .stage2_llvm and std.testing.allocator_instance.deinit()) {
+            if (gpa_works and std.testing.allocator_instance.deinit()) {
                 leaks += 1;
             }
         }