operation is runtime due to this operand for @intFromPtr

[HyperCodec]

Zig Version

0.13.0 (or latest 0.14.0 dev)

Steps to Reproduce and Observed Behavior

Following an example for comptime JSON, I wrote the following:

pub const dictionary = d: {
    const dict_raw = @embedFile("dict.json");

    // TODO figure out buffer size
    var buf: [1024]u8 = undefined;
    var fba = std.heap.FixedBufferAllocator.init(&buf);
    const alloc = fba.allocator();

    const words = std.json.parseFromSliceLeaky([]WordData, alloc, dict_raw, .{}) catch unreachable;

    var dict = std.StringHashMap([]WordData).init(alloc);

   // TODO multi map entries

    break :d dict;
};

However, I get the following error when trying to build:

C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem.zig:3790:18: error: unable to evaluate comptime expression 
    const addr = @intFromPtr(ptr);
                 ^~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem.zig:3790:30: note: operation is runtime due to this operand
    const addr = @intFromPtr(ptr);
                             ^~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\heap.zig:427:50: note: called from here
        const adjust_off = mem.alignPointerOffset(self.buffer.ptr + self.end_index, ptr_align) orelse return null;
                           ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem\Allocator.zig:86:29: note: called from here
    return self.vtable.alloc(self.ptr, len, ptr_align, ret_addr);
           ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem\Allocator.zig:225:35: note: called from here
    const byte_ptr = self.rawAlloc(byte_count, log2a(alignment), return_address) orelse return Error.OutOfMemory;
                     ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem\Allocator.zig:211:40: note: called from here
    return self.allocBytesWithAlignment(alignment, byte_count, return_address);
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem\Allocator.zig:205:75: note: called from here
    const ptr: [*]align(a) T = @ptrCast(try self.allocWithSizeAndAlignment(@sizeOf(T), a, n, return_address));
                                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\mem\Allocator.zig:193:41: note: called from here
    return self.allocAdvancedWithRetAddr(T, alignment, n, @returnAddress());
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\array_list.zig:457:67: note: called from here
                const new_memory = try self.allocator.alignedAlloc(T, alignment, new_capacity);
                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\array_list.zig:434:51: note: called from here
            return self.ensureTotalCapacityPrecise(better_capacity);
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\array_list.zig:468:44: note: called from here
            return self.ensureTotalCapacity(try addOrOom(self.items.len, additional_count));
                   ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\json\static.zig:466:67: note: called from here
                                try arraylist.ensureUnusedCapacity(1);
                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\json\static.zig:140:33: note: called from here
    const value = try innerParse(T, allocator, scanner_or_reader, resolved_options);
                      ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\trist\zigup\zig\0.13.0\files\lib\std\json\static.zig:88:37: note: called from here
    return parseFromTokenSourceLeaky(T, allocator, &scanner, options);
           ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
root.zig:42:59: note: called from here
    const words = std.json.parseFromSliceLeaky([]WordData, alloc, dict_raw, .{}) catch unreachable;

Why is @intFromPtr not usable in comptime?

Expected Behavior

The code properly deserializes the JSON at compile time.

[HyperCodec]

Running the exact example code works fine (aside from the first attempt where it spammed error: Unexpected with no stacktrace, then I changed nothing and reran and it worked). Adding slices to the payload/type causes a similar error to the one above.

[nektro]

this is a known limitation. the result of @intFromPtr is always runtime-known even when passed a comptime-known address because the actual number backing a constant isn't knowable until linking.

related: #15080, #22177, #14931