diff --git a/ash/Cargo.toml b/ash/Cargo.toml
index 0e2bb56..2d2fec2 100644
--- a/ash/Cargo.toml
+++ b/ash/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/MaikKlein/ash"
 readme = "../README.md"
 keywords = ["vulkan", "graphic"]
 documentation = "https://docs.rs/ash"
+edition = "2018"
 
 [dependencies]
 shared_library = "0.1.9"
diff --git a/ash/src/device.rs b/ash/src/device.rs
index 5684678..c2ef365 100644
--- a/ash/src/device.rs
+++ b/ash/src/device.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::vk;
+use crate::RawPtr;
 use std::mem;
 use std::os::raw::c_void;
 use std::ptr;
-use vk;
-use RawPtr;
 
 #[allow(non_camel_case_types)]
 pub trait DeviceV1_1: DeviceV1_0 {
diff --git a/ash/src/entry.rs b/ash/src/entry.rs
index ca6cef3..be3d52d 100644
--- a/ash/src/entry.rs
+++ b/ash/src/entry.rs
@@ -1,5 +1,7 @@
-use instance::Instance;
-use prelude::*;
+use crate::instance::Instance;
+use crate::prelude::*;
+use crate::vk;
+use crate::RawPtr;
 use shared_library::dynamic_library::DynamicLibrary;
 use std::error::Error;
 use std::fmt;
@@ -9,8 +11,6 @@ use std::os::raw::c_void;
 use std::path::Path;
 use std::ptr;
 use std::sync::Arc;
-use vk;
-use RawPtr;
 
 #[cfg(windows)]
 const LIB_PATH: &'static str = "vulkan-1.dll";
diff --git a/ash/src/extensions/experimental/amd.rs b/ash/src/extensions/experimental/amd.rs
index a68f057..33292c3 100644
--- a/ash/src/extensions/experimental/amd.rs
+++ b/ash/src/extensions/experimental/amd.rs
@@ -23,9 +23,9 @@
  *
  **********************************************************************************************************************/
 
+use crate::vk::*;
 use std::fmt;
 use std::os::raw::*;
-use vk::*;
 
 // Extension: `VK_AMD_gpa_interface`
 
diff --git a/ash/src/extensions/ext/debug_marker.rs b/ash/src/extensions/ext/debug_marker.rs
index 11f6ce6..eeead34 100644
--- a/ash/src/extensions/ext/debug_marker.rs
+++ b/ash/src/extensions/ext/debug_marker.rs
@@ -1,9 +1,9 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{DeviceV1_0, InstanceV1_0};
+use crate::vk;
 use std::ffi::CStr;
 use std::mem;
-use version::{DeviceV1_0, InstanceV1_0};
-use vk;
 
 #[derive(Clone)]
 pub struct DebugMarker {
diff --git a/ash/src/extensions/ext/debug_report.rs b/ash/src/extensions/ext/debug_report.rs
index 1d50117..e22cb73 100644
--- a/ash/src/extensions/ext/debug_report.rs
+++ b/ash/src/extensions/ext/debug_report.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{EntryV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
-use version::{EntryV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct DebugReport {
diff --git a/ash/src/extensions/ext/debug_utils.rs b/ash/src/extensions/ext/debug_utils.rs
index a8acffd..8760121 100644
--- a/ash/src/extensions/ext/debug_utils.rs
+++ b/ash/src/extensions/ext/debug_utils.rs
@@ -1,9 +1,9 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{EntryV1_0, InstanceV1_0};
+use crate::{vk, RawPtr};
 use std::ffi::CStr;
 use std::mem;
-use version::{EntryV1_0, InstanceV1_0};
-use {vk, RawPtr};
 
 #[derive(Clone)]
 pub struct DebugUtils {
diff --git a/ash/src/extensions/khr/android_surface.rs b/ash/src/extensions/khr/android_surface.rs
index d9d343d..c9286e2 100644
--- a/ash/src/extensions/khr/android_surface.rs
+++ b/ash/src/extensions/khr/android_surface.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{EntryV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
-use version::{EntryV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct AndroidSurface {
diff --git a/ash/src/extensions/khr/display_swapchain.rs b/ash/src/extensions/khr/display_swapchain.rs
index 29c3b5d..c11690b 100644
--- a/ash/src/extensions/khr/display_swapchain.rs
+++ b/ash/src/extensions/khr/display_swapchain.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{DeviceV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
-use version::{DeviceV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct DisplaySwapchain {
diff --git a/ash/src/extensions/khr/surface.rs b/ash/src/extensions/khr/surface.rs
index 03e4867..2ff85b6 100644
--- a/ash/src/extensions/khr/surface.rs
+++ b/ash/src/extensions/khr/surface.rs
@@ -1,11 +1,11 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{EntryV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
 use std::ptr;
-use version::{EntryV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct Surface {
diff --git a/ash/src/extensions/khr/swapchain.rs b/ash/src/extensions/khr/swapchain.rs
index ade5d04..1470246 100644
--- a/ash/src/extensions/khr/swapchain.rs
+++ b/ash/src/extensions/khr/swapchain.rs
@@ -1,11 +1,11 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{DeviceV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
 use std::ptr;
-use version::{DeviceV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct Swapchain {
diff --git a/ash/src/extensions/mvk/ios_surface.rs b/ash/src/extensions/mvk/ios_surface.rs
index 4aac1c5..c86f439 100644
--- a/ash/src/extensions/mvk/ios_surface.rs
+++ b/ash/src/extensions/mvk/ios_surface.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{EntryV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
-use version::{EntryV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct IOSSurface {
diff --git a/ash/src/extensions/mvk/macos_surface.rs b/ash/src/extensions/mvk/macos_surface.rs
index 9dbf44b..992f864 100644
--- a/ash/src/extensions/mvk/macos_surface.rs
+++ b/ash/src/extensions/mvk/macos_surface.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{EntryV1_0, InstanceV1_0};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
-use version::{EntryV1_0, InstanceV1_0};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct MacOSSurface {
diff --git a/ash/src/extensions/nv/mesh_shader.rs b/ash/src/extensions/nv/mesh_shader.rs
index c982951..20e3fea 100644
--- a/ash/src/extensions/nv/mesh_shader.rs
+++ b/ash/src/extensions/nv/mesh_shader.rs
@@ -1,8 +1,8 @@
 #![allow(dead_code)]
+use crate::version::{DeviceV1_0, InstanceV1_0};
+use crate::vk;
 use std::ffi::CStr;
 use std::mem;
-use version::{DeviceV1_0, InstanceV1_0};
-use vk;
 
 #[derive(Clone)]
 pub struct MeshShader {
diff --git a/ash/src/extensions/nv/ray_tracing.rs b/ash/src/extensions/nv/ray_tracing.rs
index 02aa71f..591aa6a 100644
--- a/ash/src/extensions/nv/ray_tracing.rs
+++ b/ash/src/extensions/nv/ray_tracing.rs
@@ -1,10 +1,10 @@
 #![allow(dead_code)]
-use prelude::*;
+use crate::prelude::*;
+use crate::version::{DeviceV1_0, InstanceV1_0, InstanceV1_1};
+use crate::vk;
+use crate::RawPtr;
 use std::ffi::CStr;
 use std::mem;
-use version::{DeviceV1_0, InstanceV1_0, InstanceV1_1};
-use vk;
-use RawPtr;
 
 #[derive(Clone)]
 pub struct RayTracing {
diff --git a/ash/src/instance.rs b/ash/src/instance.rs
index 4db5ceb..1cb3bf1 100644
--- a/ash/src/instance.rs
+++ b/ash/src/instance.rs
@@ -1,11 +1,11 @@
 #![allow(dead_code)]
-use device::Device;
-use prelude::*;
+use crate::device::Device;
+use crate::prelude::*;
+use crate::vk;
+use crate::RawPtr;
 use std::mem;
 use std::os::raw::c_char;
 use std::ptr;
-use vk;
-use RawPtr;
 
 #[doc = "<https://www.khronos.org/registry/vulkan/specs/1.1-extensions/man/html/VkInstance.html>"]
 #[derive(Clone)]
diff --git a/ash/src/lib.rs b/ash/src/lib.rs
index d6e5fc2..caa2ad3 100644
--- a/ash/src/lib.rs
+++ b/ash/src/lib.rs
@@ -23,11 +23,9 @@
 //! ```
 //!
 
-extern crate shared_library;
-
-pub use device::Device;
-pub use entry::{Entry, EntryCustom, InstanceError, LoadingError};
-pub use instance::Instance;
+pub use crate::device::Device;
+pub use crate::entry::{Entry, EntryCustom, InstanceError, LoadingError};
+pub use crate::instance::Instance;
 
 mod device;
 mod entry;
diff --git a/ash/src/prelude.rs b/ash/src/prelude.rs
index a01406c..b4a888c 100644
--- a/ash/src/prelude.rs
+++ b/ash/src/prelude.rs
@@ -1,2 +1,2 @@
-use vk;
+use crate::vk;
 pub type VkResult<T> = Result<T, vk::Result>;
diff --git a/ash/src/util.rs b/ash/src/util.rs
index 178da36..d2f50d5 100644
--- a/ash/src/util.rs
+++ b/ash/src/util.rs
@@ -1,9 +1,9 @@
+use crate::vk;
 use std::iter::Iterator;
 use std::marker::PhantomData;
 use std::mem::size_of;
 use std::os::raw::c_void;
 use std::{io, slice};
-use vk;
 
 /// `Align` handles dynamic alignment. The is useful for dynamic uniform buffers where
 /// the alignment might be different. For example a 4x4 f32 matrix has a size of 64 bytes
diff --git a/ash/src/version.rs b/ash/src/version.rs
index 922f6bf..e6121a8 100644
--- a/ash/src/version.rs
+++ b/ash/src/version.rs
@@ -1,3 +1,3 @@
-pub use device::{DeviceV1_0, DeviceV1_1};
-pub use entry::{EntryV1_0, EntryV1_1};
-pub use instance::{InstanceV1_0, InstanceV1_1};
+pub use crate::device::{DeviceV1_0, DeviceV1_1};
+pub use crate::entry::{EntryV1_0, EntryV1_1};
+pub use crate::instance::{InstanceV1_0, InstanceV1_1};
diff --git a/ash/src/vk.rs b/ash/src/vk.rs
index bcd41b8..711b0e4 100644
--- a/ash/src/vk.rs
+++ b/ash/src/vk.rs
@@ -18,7 +18,7 @@ pub(crate) unsafe fn ptr_chain_iter<T>(ptr: &mut T) -> impl Iterator<Item = *mut
 pub trait Handle {
     const TYPE: ObjectType;
     fn as_raw(self) -> u64;
-    fn from_raw(u64) -> Self;
+    fn from_raw(_: u64) -> Self;
 }
 #[doc = "<https://www.khronos.org/registry/vulkan/specs/1.1-extensions/man/html/VK_MAKE_VERSION.html>"]
 #[macro_export]
@@ -85,19 +85,19 @@ macro_rules! vk_bitflags_wrapped {
         }
         impl $name {
             #[inline]
-            pub fn empty() -> $name {
+            pub const fn empty() -> $name {
                 $name(0)
             }
             #[inline]
-            pub fn all() -> $name {
+            pub const fn all() -> $name {
                 $name($all)
             }
             #[inline]
-            pub fn from_raw(x: $flag_type) -> Self {
+            pub const fn from_raw(x: $flag_type) -> Self {
                 $name(x)
             }
             #[inline]
-            pub fn as_raw(self) -> $flag_type {
+            pub const fn as_raw(self) -> $flag_type {
                 self.0
             }
             #[inline]
@@ -199,7 +199,7 @@ macro_rules! handle_nondispatchable {
             }
         }
         impl $name {
-            pub fn null() -> $name {
+            pub const fn null() -> $name {
                 $name(0)
             }
         }
@@ -242,7 +242,7 @@ macro_rules! define_handle {
         unsafe impl Send for $name {}
         unsafe impl Sync for $name {}
         impl $name {
-            pub fn null() -> Self {
+            pub const fn null() -> Self {
                 $name(::std::ptr::null_mut())
             }
         }
diff --git a/ash/tests/constant_size_arrays.rs b/ash/tests/constant_size_arrays.rs
index f736c0a..74378e9 100644
--- a/ash/tests/constant_size_arrays.rs
+++ b/ash/tests/constant_size_arrays.rs
@@ -1,4 +1,4 @@
-extern crate ash;
+use ash;
 
 use ash::vk::{PhysicalDeviceProperties, PipelineColorBlendStateCreateInfo};
 
diff --git a/ash/tests/display.rs b/ash/tests/display.rs
index 8746022..f4131fd 100644
--- a/ash/tests/display.rs
+++ b/ash/tests/display.rs
@@ -1,4 +1,3 @@
-extern crate ash;
 use ash::vk;
 
 #[test]
diff --git a/examples/Cargo.toml b/examples/Cargo.toml
index 1ff2abf..27c4cea 100644
--- a/examples/Cargo.toml
+++ b/examples/Cargo.toml
@@ -2,6 +2,7 @@
 name = "examples"
 version = "0.1.0"
 authors = ["maik klein <maikklein@googlemail.com>"]
+edition = "2018"
 
 [dependencies]
 winit = "0.16"
diff --git a/examples/src/bin/texture.rs b/examples/src/bin/texture.rs
index 42664a5..3fd0976 100644
--- a/examples/src/bin/texture.rs
+++ b/examples/src/bin/texture.rs
@@ -1,7 +1,3 @@
-extern crate ash;
-extern crate examples;
-extern crate image;
-
 use std::default::Default;
 use std::ffi::CString;
 use std::fs::File;
diff --git a/examples/src/bin/triangle.rs b/examples/src/bin/triangle.rs
index 0104344..936dea5 100644
--- a/examples/src/bin/triangle.rs
+++ b/examples/src/bin/triangle.rs
@@ -1,6 +1,3 @@
-extern crate ash;
-extern crate examples;
-
 use ash::util::*;
 use ash::vk;
 use examples::*;
diff --git a/generator/Cargo.toml b/generator/Cargo.toml
index 12ffbd5..215d66b 100644
--- a/generator/Cargo.toml
+++ b/generator/Cargo.toml
@@ -2,6 +2,7 @@
 name = "generator"
 version = "0.1.0"
 authors = ["Maik Klein <maikklein@googlemail.com>"]
+edition = "2018"
 
 [dependencies]
 vk-parse = "0.2"
diff --git a/generator/src/bin/generator.rs b/generator/src/bin/generator.rs
index c639a2a..42d33ff 100644
--- a/generator/src/bin/generator.rs
+++ b/generator/src/bin/generator.rs
@@ -1,4 +1,3 @@
-extern crate generator;
 use generator::write_source_code;
 use std::path::Path;
 
diff --git a/generator/src/lib.rs b/generator/src/lib.rs
index a63ca4a..9c0587b 100644
--- a/generator/src/lib.rs
+++ b/generator/src/lib.rs
@@ -1,14 +1,13 @@
 #![recursion_limit = "256"]
-extern crate heck;
-extern crate itertools;
+
 #[macro_use]
 extern crate nom;
-extern crate proc_macro2;
+use proc_macro2;
 #[macro_use]
 extern crate quote;
-extern crate syn;
-pub extern crate vk_parse;
-pub extern crate vkxml;
+use syn;
+pub use vk_parse;
+pub use vkxml;
 
 use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
 use itertools::Itertools;
@@ -122,7 +121,7 @@ pub fn define_handle_macro() -> Tokens {
                 unsafe impl Sync for $name {}
 
                 impl $name{
-                    pub fn null() -> Self{
+                    pub const fn null() -> Self{
                         $name(::std::ptr::null_mut())
                     }
                 }
@@ -163,7 +162,7 @@ pub fn handle_nondispatchable_macro() -> Tokens {
                 }
 
                 impl $name{
-                    pub fn null() -> $name{
+                    pub const fn null() -> $name{
                         $name(0)
                     }
                 }
@@ -232,20 +231,20 @@ pub fn vk_bitflags_wrapped_macro() -> Tokens {
 
                 impl $name {
                     #[inline]
-                    pub fn empty() -> $name {
+                    pub const fn empty() -> $name {
                         $name(0)
                     }
 
                     #[inline]
-                    pub fn all() -> $name {
+                    pub const fn all() -> $name {
                         $name($all)
                     }
 
                     #[inline]
-                    pub fn from_raw(x: $flag_type) -> Self { $name(x) }
+                    pub const fn from_raw(x: $flag_type) -> Self { $name(x) }
 
                     #[inline]
-                    pub fn as_raw(self) -> $flag_type { self.0 }
+                    pub const fn as_raw(self) -> $flag_type { self.0 }
 
                     #[inline]
                     pub fn is_empty(self) -> bool {
@@ -1432,7 +1431,7 @@ pub fn derive_setters(
         _ => None,
     });
 
-    let (has_next, is_next_const) = match members
+    let (has_next, _is_next_const) = match members
         .clone()
         .find(|field| field.param_ident().to_string() == "p_next")
     {
@@ -2275,7 +2274,7 @@ pub fn write_source_code(path: &Path) {
         pub trait Handle {
             const TYPE: ObjectType;
             fn as_raw(self) -> u64;
-            fn from_raw(u64) -> Self;
+            fn from_raw(_: u64) -> Self;
         }
 
         #version_macros