fn free(ctx: *anyopaque, mem: []u8, a: std.mem.Alignment, _: usize) void 612
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616 fn free(ctx: *anyopaque, mem: []u8, a: std.mem.Alignment, _: usize) void {
const f: *FuzzAllocator = @ptrCast(@alignCast(ctx));
assert(a == .@"4");
f.used_bitmap ^= @as(u2, 1) << f.memSlot(mem);
}