Set edition to 2018.

Cargo.toml

@@ -1,8 +1,9 @@
 [package]
 name = "qrcode"
 description = "QR code encoder in Rust"
-license = "MIT / Apache-2.0"
+license = "MIT OR Apache-2.0"
-version = "0.11.0"
+version = "0.11.1"
+edition = "2018"
 authors = ["kennytm <kennytm@gmail.com>"]
 keywords = ["qrcode"]
 repository = "https://github.com/kennytm/qrcode-rust"

README.md

@@ -4,7 +4,7 @@ qrcode-rust
 [![Build status](https://travis-ci.org/kennytm/qrcode-rust.svg?branch=master)](https://travis-ci.org/kennytm/qrcode-rust)
 [![Coverage Status](https://coveralls.io/repos/github/kennytm/qrcode-rust/badge.svg?branch=coveralls)](https://coveralls.io/github/kennytm/qrcode-rust?branch=coveralls)
 [![crates.io](https://img.shields.io/crates/v/qrcode.svg)](https://crates.io/crates/qrcode)
-[![MIT / Apache 2.0](https://img.shields.io/badge/license-MIT%20%2f%20Apache%202.0-blue.svg)](./LICENSE-APACHE.txt)
+[![MIT OR Apache 2.0](https://img.shields.io/badge/license-MIT%20%2f%20Apache%202.0-blue.svg)](./LICENSE-APACHE.txt)
 
 QR code and Micro QR code encoder in Rust. [Documentation](https://docs.rs/qrcode).
 
@@ -13,14 +13,14 @@ Cargo.toml
 
 ```toml
 [dependencies]
-qrcode = "0.8"
+qrcode = "0.11"
 ```
 
 The default settings will depend on the `image` crate. If you don't need image generation capability, disable the `default-features`:
 
 ```toml
 [dependencies]
-qrcode = { version = "0.8", default-features = false }
+qrcode = { version = "0.11", default-features = false }
 ```
 
 Example
@@ -29,9 +29,6 @@ Example
 ## Image generation
 
 ```rust
-extern crate qrcode;
-extern crate image;
-
 use qrcode::QrCode;
 use image::Luma;
 
@@ -54,7 +51,6 @@ Generates this image:
 ## String generation
 
 ```rust
-extern crate qrcode;
 use qrcode::QrCode;
 
 fn main() {
@@ -96,8 +92,6 @@ Generates this output:
 ## SVG generation
 
 ```rust
-extern crate qrcode;
-
 use qrcode::{QrCode, Version, EcLevel};
 use qrcode::render::svg;
 

examples/encode_image.rs

@@ -1,6 +1,3 @@
-extern crate image;
-extern crate qrcode;
-
 use image::Luma;
 use qrcode::QrCode;
 

examples/encode_string.rs

@@ -1,4 +1,3 @@
-extern crate qrcode;
 use qrcode::QrCode;
 
 fn main() {

examples/encode_svg.rs

@@ -1,5 +1,3 @@
-extern crate qrcode;
-
 use qrcode::render::svg;
 use qrcode::{EcLevel, QrCode, Version};
 

src/bin/qrencode.rs

@@ -1,5 +1,3 @@
-extern crate qrcode;
-
 use std::env;
 
 pub fn main() {

src/bits.rs

@@ -3,11 +3,11 @@
 use std::cmp::min;
 
 #[cfg(feature = "bench")]
-use test::{black_box, Bencher};
+extern crate test;
 
-use cast::{As, Truncate};
+use crate::cast::{As, Truncate};
-use optimize::{total_encoded_len, Optimizer, Parser, Segment};
+use crate::optimize::{total_encoded_len, Optimizer, Parser, Segment};
-use types::{EcLevel, Mode, QrError, QrResult, Version};
+use crate::types::{EcLevel, Mode, QrError, QrResult, Version};
 
 //------------------------------------------------------------------------------
 //{{{ Bits
@@ -36,17 +36,17 @@ impl Bits {
         let b = self.bit_offset + n;
         let last_index = self.data.len().wrapping_sub(1);
         match (self.bit_offset, b) {
-            (0, 0...8) => {
+            (0, 0..=8) => {
                 self.data.push((number << (8 - b)).truncate_as_u8());
             }
             (0, _) => {
                 self.data.push((number >> (b - 8)).truncate_as_u8());
                 self.data.push((number << (16 - b)).truncate_as_u8());
             }
-            (_, 0...8) => {
+            (_, 0..=8) => {
                 self.data[last_index] |= (number << (8 - b)).truncate_as_u8();
             }
-            (_, 9...16) => {
+            (_, 9..=16) => {
                 self.data[last_index] |= (number >> (b - 8)).truncate_as_u8();
                 self.data.push((number << (16 - b)).truncate_as_u8());
             }
@@ -141,7 +141,7 @@ fn test_push_number() {
 
 #[cfg(feature = "bench")]
 #[bench]
-fn bench_push_splitted_bytes(bencher: &mut Bencher) {
+fn bench_push_splitted_bytes(bencher: &mut test::Bencher) {
     bencher.iter(|| {
         let mut bits = Bits::new(Version::Normal(40));
         bits.push_number(4, 0b0101);
@@ -182,7 +182,7 @@ impl Bits {
     /// If the mode is not supported in the provided version, this method
     /// returns `Err(QrError::UnsupportedCharacterSet)`.
     pub fn push_mode_indicator(&mut self, mode: ExtendedMode) -> QrResult<()> {
-        #[cfg_attr(feature = "cargo-clippy", allow(match_same_arms))]
+        #[allow(clippy::match_same_arms)]
         let number = match (self.version, mode) {
             (Version::Micro(1), ExtendedMode::Data(Mode::Numeric)) => return Ok(()),
             (Version::Micro(_), ExtendedMode::Data(Mode::Numeric)) => 0,
@@ -226,7 +226,7 @@ impl Bits {
     ///
     ///
     /// The full list of ECI designator values can be found from
-    /// http://strokescribe.com/en/ECI.html. Some example values are:
+    /// <http://strokescribe.com/en/ECI.html>. Some example values are:
     ///
     /// ECI # | Character set
     /// ------|-------------------------------------
@@ -248,14 +248,14 @@ impl Bits {
         self.reserve(12); // assume the common case that eci_designator <= 127.
         self.push_mode_indicator(ExtendedMode::Eci)?;
         match eci_designator {
-            0...127 => {
+            0..=127 => {
                 self.push_number(8, eci_designator.as_u16());
             }
-            128...16383 => {
+            128..=16383 => {
                 self.push_number(2, 0b10);
                 self.push_number(14, eci_designator.as_u16());
             }
-            16384...999_999 => {
+            16384..=999_999 => {
                 self.push_number(3, 0b110);
                 self.push_number(5, (eci_designator >> 16).as_u16());
                 self.push_number(16, (eci_designator & 0xffff).as_u16());
@@ -268,8 +268,8 @@ impl Bits {
 
 #[cfg(test)]
 mod eci_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{QrError, Version};
+    use crate::types::{QrError, Version};
 
     #[test]
     fn test_9() {
@@ -334,8 +334,8 @@ impl Bits {
 
 #[cfg(test)]
 mod numeric_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{QrError, Version};
+    use crate::types::{QrError, Version};
 
     #[test]
     fn test_iso_18004_2006_example_1() {
@@ -405,8 +405,8 @@ mod numeric_tests {
 #[inline]
 fn alphanumeric_digit(character: u8) -> u16 {
     match character {
-        b'0'...b'9' => u16::from(character - b'0'),
+        b'0'..=b'9' => u16::from(character - b'0'),
-        b'A'...b'Z' => u16::from(character - b'A') + 10,
+        b'A'..=b'Z' => u16::from(character - b'A') + 10,
         b' ' => 36,
         b'$' => 37,
         b'%' => 38,
@@ -438,8 +438,8 @@ impl Bits {
 
 #[cfg(test)]
 mod alphanumeric_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{QrError, Version};
+    use crate::types::{QrError, Version};
 
     #[test]
     fn test_iso_18004_2006_example() {
@@ -481,8 +481,8 @@ impl Bits {
 
 #[cfg(test)]
 mod byte_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{QrError, Version};
+    use crate::types::{QrError, Version};
 
     #[test]
     fn test() {
@@ -541,8 +541,8 @@ impl Bits {
 
 #[cfg(test)]
 mod kanji_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{QrError, Version};
+    use crate::types::{QrError, Version};
 
     #[test]
     fn test_iso_18004_example() {
@@ -707,8 +707,8 @@ impl Bits {
 
 #[cfg(test)]
 mod finish_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{EcLevel, QrError, Version};
+    use crate::types::{EcLevel, QrError, Version};
 
     #[test]
     fn test_hello_world() {
@@ -795,8 +795,8 @@ impl Bits {
 
 #[cfg(test)]
 mod encode_tests {
-    use bits::Bits;
+    use crate::bits::Bits;
-    use types::{EcLevel, QrError, QrResult, Version};
+    use crate::types::{EcLevel, QrError, QrResult, Version};
 
     fn encode(data: &[u8], version: Version, ec_level: EcLevel) -> QrResult<Vec<u8>> {
         let mut bits = Bits::new(version);
@@ -859,7 +859,7 @@ pub fn encode_auto(data: &[u8], ec_level: EcLevel) -> QrResult<Bits> {
 /// Finds the smallest version (QR code only) that can store N bits of data
 /// in the given error correction level.
 fn find_min_version(length: usize, ec_level: EcLevel) -> Version {
-    let mut base = 0usize;
+    let mut base = 0_usize;
     let mut size = 39;
     while size > 1 {
         let half = size / 2;
@@ -877,8 +877,8 @@ fn find_min_version(length: usize, ec_level: EcLevel) -> Version {
 
 #[cfg(test)]
 mod encode_auto_tests {
-    use bits::{encode_auto, find_min_version};
+    use crate::bits::{encode_auto, find_min_version};
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_find_min_version() {
@@ -912,7 +912,9 @@ mod encode_auto_tests {
 
 #[cfg(feature = "bench")]
 #[bench]
-fn bench_find_min_version(bencher: &mut Bencher) {
+fn bench_find_min_version(bencher: &mut test::Bencher) {
+    use test::black_box;
+
     bencher.iter(|| {
         black_box(find_min_version(60, EcLevel::L));
         black_box(find_min_version(200, EcLevel::L));

src/canvas.rs

@@ -11,8 +11,8 @@
 
 use std::cmp::max;
 
-use cast::As;
+use crate::cast::As;
-use types::{Color, EcLevel, Version};
+use crate::types::{Color, EcLevel, Version};
 
 //------------------------------------------------------------------------------
 //{{{ Modules
@@ -144,8 +144,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod basic_canvas_tests {
-    use canvas::{Canvas, Module};
+    use crate::canvas::{Canvas, Module};
-    use types::{Color, EcLevel, Version};
+    use crate::types::{Color, EcLevel, Version};
 
     #[test]
     fn test_index() {
@@ -221,7 +221,7 @@ impl Canvas {
                 self.put(
                     x + i,
                     y + j,
-                    #[cfg_attr(feature = "cargo-clippy", allow(match_same_arms))]
+                    #[allow(clippy::match_same_arms)]
                     match (i, j) {
                         (4, _) | (_, 4) | (-4, _) | (_, -4) => Color::Light,
                         (3, _) | (_, 3) | (-3, _) | (_, -3) => Color::Dark,
@@ -253,8 +253,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod finder_pattern_tests {
-    use canvas::Canvas;
+    use crate::canvas::Canvas;
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_qr() {
@@ -340,7 +340,7 @@ impl Canvas {
     fn draw_alignment_patterns(&mut self) {
         match self.version {
             Version::Micro(_) | Version::Normal(1) => {}
-            Version::Normal(2...6) => self.draw_alignment_pattern_at(-7, -7),
+            Version::Normal(2..=6) => self.draw_alignment_pattern_at(-7, -7),
             Version::Normal(a) => {
                 let positions = ALIGNMENT_PATTERN_POSITIONS[(a - 7).as_usize()];
                 for x in positions.iter() {
@@ -355,8 +355,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod alignment_pattern_tests {
-    use canvas::Canvas;
+    use crate::canvas::Canvas;
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_draw_alignment_patterns_1() {
@@ -490,7 +490,7 @@ mod alignment_pattern_tests {
 /// `ALIGNMENT_PATTERN_POSITIONS` describes the x- and y-coordinates of the
 /// center of the alignment patterns. Since the QR code is symmetric, only one
 /// coordinate is needed.
-static ALIGNMENT_PATTERN_POSITIONS: [&'static [i16]; 34] = [
+static ALIGNMENT_PATTERN_POSITIONS: [&[i16]; 34] = [
     &[6, 22, 38],
     &[6, 24, 42],
     &[6, 26, 46],
@@ -576,8 +576,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod timing_pattern_tests {
-    use canvas::Canvas;
+    use crate::canvas::Canvas;
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_draw_timing_patterns_qr() {
@@ -675,9 +675,7 @@ impl Canvas {
     /// Draws the version information patterns.
     fn draw_version_info_patterns(&mut self) {
         match self.version {
-            Version::Micro(_) | Version::Normal(1...6) => {
+            Version::Micro(_) | Version::Normal(1..=6) => {}
-                return;
-            }
             Version::Normal(a) => {
                 let version_info = VERSION_INFOS[(a - 7).as_usize()];
                 self.draw_number(version_info, 18, Color::Dark, Color::Light, &VERSION_INFO_COORDS_BL);
@@ -689,8 +687,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod draw_version_info_tests {
-    use canvas::Canvas;
+    use crate::canvas::Canvas;
-    use types::{Color, EcLevel, Version};
+    use crate::types::{Color, EcLevel, Version};
 
     #[test]
     fn test_draw_number() {
@@ -1017,8 +1015,8 @@ pub fn is_functional(version: Version, width: i16, x: i16, y: i16) -> bool {
 
 #[cfg(test)]
 mod all_functional_patterns_tests {
-    use canvas::{is_functional, Canvas};
+    use crate::canvas::{is_functional, Canvas};
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_all_functional_patterns_qr() {
@@ -1186,10 +1184,10 @@ impl Iterator for DataModuleIter {
 }
 
 #[cfg(test)]
-#[cfg_attr(rustfmt, rustfmt_skip)] // skip to prevent file becoming too long.
+#[rustfmt::skip] // skip to prevent file becoming too long.
 mod data_iter_tests {
-    use canvas::DataModuleIter;
+    use crate::canvas::DataModuleIter;
-    use types::Version;
+    use crate::types::Version;
 
     #[test]
     fn test_qr() {
@@ -1393,8 +1391,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod draw_codewords_test {
-    use canvas::Canvas;
+    use crate::canvas::Canvas;
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_micro_qr_1() {
@@ -1586,8 +1584,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod mask_tests {
-    use canvas::{Canvas, MaskPattern};
+    use crate::canvas::{Canvas, MaskPattern};
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_apply_mask_qr() {
@@ -1762,7 +1760,7 @@ impl Canvas {
         for i in 0..self.width {
             for j in 0..self.width - 6 {
                 // TODO a ref to a closure should be enough?
-                let get: Box<Fn(i16) -> Color> = if is_horizontal {
+                let get: Box<dyn Fn(i16) -> Color> = if is_horizontal {
                     Box::new(|k| self.get(k, i).into())
                 } else {
                     Box::new(|k| self.get(i, k).into())
@@ -1831,8 +1829,8 @@ impl Canvas {
 
 #[cfg(test)]
 mod penalty_tests {
-    use canvas::{Canvas, MaskPattern};
+    use crate::canvas::{Canvas, MaskPattern};
-    use types::{Color, EcLevel, Version};
+    use crate::types::{Color, EcLevel, Version};
 
     fn create_test_canvas() -> Canvas {
         let mut c = Canvas::new(Version::Normal(1), EcLevel::Q);

src/cast.rs

@@ -8,7 +8,7 @@ pub trait Truncate {
 }
 
 impl Truncate for u16 {
-    #[cfg_attr(feature = "cargo-clippy", allow(cast_possible_truncation))]
+    #[allow(clippy::cast_possible_truncation)]
     fn truncate_as_u8(self) -> u8 {
         (self & 0xff) as u8
     }
@@ -63,7 +63,6 @@ macro_rules! impl_as {
         }
 
         #[cfg(not(debug_assertions))]
-        #[cfg_attr(feature = "cargo-clippy", allow(cast_possible_truncation))]
         impl As for $ty {
             fn as_u16(self) -> u16 {
                 self as u16

src/ec.rs

@@ -2,7 +2,7 @@
 
 use std::ops::Deref;
 
-use types::{EcLevel, QrResult, Version};
+use crate::types::{EcLevel, QrResult, Version};
 
 //------------------------------------------------------------------------------
 //{{{ Error correction primitive
@@ -24,7 +24,6 @@ pub fn create_error_correction_code(data: &[u8], ec_code_size: usize) -> Vec<u8>
     res.resize(ec_code_size + data_len, 0);
 
     // rust-lang-nursery/rust-clippy#2213
-    #[cfg_attr(feature = "cargo-clippy", allow(needless_range_loop))]
     for i in 0..data_len {
         let lead_coeff = res[i] as usize;
         if lead_coeff == 0 {
@@ -42,7 +41,7 @@ pub fn create_error_correction_code(data: &[u8], ec_code_size: usize) -> Vec<u8>
 
 #[cfg(test)]
 mod ec_tests {
-    use ec::create_error_correction_code;
+    use crate::ec::create_error_correction_code;
 
     #[test]
     fn test_poly_mod_1() {
@@ -127,8 +126,8 @@ pub fn construct_codewords(rawbits: &[u8], version: Version, ec_level: EcLevel)
 
 #[cfg(test)]
 mod construct_codewords_test {
-    use ec::construct_codewords;
+    use crate::ec::construct_codewords;
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_add_ec_simple() {
@@ -164,8 +163,8 @@ mod construct_codewords_test {
 /// Computes the maximum allowed number of erratic modules can be introduced to
 /// the QR code, before the data becomes truly corrupted.
 pub fn max_allowed_errors(version: Version, ec_level: EcLevel) -> QrResult<usize> {
-    use EcLevel::{L, M};
+    use crate::EcLevel::{L, M};
-    use Version::{Micro, Normal};
+    use crate::Version::{Micro, Normal};
 
     let p = match (version, ec_level) {
         (Micro(2), L) | (Normal(1), L) => 3,
@@ -183,8 +182,8 @@ pub fn max_allowed_errors(version: Version, ec_level: EcLevel) -> QrResult<usize
 
 #[cfg(test)]
 mod max_allowed_errors_test {
-    use ec::max_allowed_errors;
+    use crate::ec::max_allowed_errors;
-    use types::{EcLevel, Version};
+    use crate::types::{EcLevel, Version};
 
     #[test]
     fn test_low_versions() {
@@ -235,7 +234,7 @@ mod max_allowed_errors_test {
 //{{{ Precomputed tables for GF(256).
 
 /// `EXP_TABLE` encodes the value of 2<sup>n</sup> in the Galois Field GF(256).
-static EXP_TABLE: &'static [u8] = b"\
+static EXP_TABLE: &[u8] = b"\
 \x01\x02\x04\x08\x10\x20\x40\x80\x1d\x3a\x74\xe8\xcd\x87\x13\x26\
 \x4c\x98\x2d\x5a\xb4\x75\xea\xc9\x8f\x03\x06\x0c\x18\x30\x60\xc0\
 \x9d\x27\x4e\x9c\x25\x4a\x94\x35\x6a\xd4\xb5\x77\xee\xc1\x9f\x23\
@@ -254,7 +253,7 @@ static EXP_TABLE: &'static [u8] = b"\
 \x2c\x58\xb0\x7d\xfa\xe9\xcf\x83\x1b\x36\x6c\xd8\xad\x47\x8e\x01";
 
 /// `LOG_TABLE` is the inverse function of `EXP_TABLE`.
-static LOG_TABLE: &'static [u8] = b"\
+static LOG_TABLE: &[u8] = b"\
 \xff\x00\x01\x19\x02\x32\x1a\xc6\x03\xdf\x33\xee\x1b\x68\xc7\x4b\
 \x04\x64\xe0\x0e\x34\x8d\xef\x81\x1c\xc1\x69\xf8\xc8\x08\x4c\x71\
 \x05\x8a\x65\x2f\xe1\x24\x0f\x21\x35\x93\x8e\xda\xf0\x12\x82\x45\
@@ -281,9 +280,9 @@ static LOG_TABLE: &'static [u8] = b"\
 /// is the Reed-Solomon error correction code.
 ///
 /// A partial list can be found from ISO/IEC 18004:2006 Annex A.
-#[cfg_attr(rustfmt, rustfmt_skip)]
+#[rustfmt::skip]
 // ^ this attribute is currently useless, see rust-lang-nursery/rustfmt#1080 and 1298
-static GENERATOR_POLYNOMIALS: [&'static [u8]; 70] = [
+static GENERATOR_POLYNOMIALS: [&[u8]; 70] = [
     b"",
     b"\x00",
     b"\x19\x01",

src/lib.rs

@@ -4,49 +4,34 @@
 //!
 #![cfg_attr(feature = "image", doc = "```rust")]
 #![cfg_attr(not(feature = "image"), doc = "```ignore")]
-//! extern crate qrcode;
-//! extern crate image;
-//!
 //! use qrcode::QrCode;
 //! use image::Luma;
 //!
-//! fn main() {
+//! // Encode some data into bits.
-//!     // Encode some data into bits.
+//! let code = QrCode::new(b"01234567").unwrap();
-//!     let code = QrCode::new(b"01234567").unwrap();
 //!
-//!     // Render the bits into an image.
+//! // Render the bits into an image.
-//!     let image = code.render::<Luma<u8>>().build();
+//! let image = code.render::<Luma<u8>>().build();
 //!
-//!     // Save the image.
+//! // Save the image.
-//!     image.save("/tmp/qrcode.png").unwrap();
+//! image.save("/tmp/qrcode.png").unwrap();
 //!
-//!     // You can also render it into a string.
+//! // You can also render it into a string.
-//!     let string = code.render()
+//! let string = code.render()
-//!         .light_color(' ')
+//!     .light_color(' ')
-//!         .dark_color('#')
+//!     .dark_color('#')
-//!         .build();
+//!     .build();
-//!     println!("{}", string);
+//! println!("{}", string);
-//! }
 //! ```
 
 #![cfg_attr(feature = "bench", feature(test, external_doc))] // Unstable libraries
-#![cfg_attr(feature = "cargo-clippy", deny(warnings, clippy_pedantic))]
+#![deny(warnings, clippy::pedantic)]
-#![cfg_attr(
+#![allow(
-    feature = "cargo-clippy",
+    clippy::must_use_candidate, // This is just annoying.
-    allow(
+    clippy::use_self, // Rust 1.33 doesn't support Self::EnumVariant, let's try again in 1.37.
-        indexing_slicing,
-        write_literal, // see https://github.com/rust-lang-nursery/rust-clippy/issues/2976
-    )
 )]
 #![cfg_attr(feature = "bench", doc(include = "../README.md"))]
 // ^ make sure we can test our README.md.
-#![cfg_attr(feature = "cargo-clippy", allow())]
-
-extern crate checked_int_cast;
-#[cfg(feature = "image")]
-extern crate image;
-#[cfg(feature = "bench")]
-extern crate test;
 
 use std::ops::Index;
 
@@ -58,11 +43,11 @@ pub mod optimize;
 pub mod render;
 pub mod types;
 
-pub use types::{Color, EcLevel, QrResult, Version};
+pub use crate::types::{Color, EcLevel, QrResult, Version};
 
-use cast::As;
+use crate::cast::As;
+use crate::render::{Pixel, Renderer};
 use checked_int_cast::CheckedIntCast;
-use render::{Pixel, Renderer};
 
 /// The encoded QR code symbol.
 #[derive(Clone)]
@@ -224,11 +209,8 @@ impl QrCode {
     ///
     #[cfg_attr(feature = "image", doc = " ```rust")]
     #[cfg_attr(not(feature = "image"), doc = " ```ignore")]
-    /// # extern crate image;
-    /// # extern crate qrcode;
     /// # use qrcode::QrCode;
     /// # use image::Rgb;
-    /// # fn main() {
     ///
     /// let image = QrCode::new(b"hello").unwrap()
     ///                     .render()
@@ -237,8 +219,6 @@ impl QrCode {
     ///                     .quiet_zone(false)          // disable quiet zone (white border)
     ///                     .min_dimensions(300, 300)   // sets minimum image size
     ///                     .build();
-    ///
-    /// # }
     /// ```
     ///
     /// Note: the `image` crate itself also provides method to rotate the image,
@@ -260,7 +240,7 @@ impl Index<(usize, usize)> for QrCode {
 
 #[cfg(test)]
 mod tests {
-    use {EcLevel, QrCode, Version};
+    use crate::{EcLevel, QrCode, Version};
 
     #[test]
     fn test_annex_i_qr() {
@@ -318,8 +298,8 @@ mod tests {
 
 #[cfg(all(test, feature = "image"))]
 mod image_tests {
+    use crate::{EcLevel, QrCode, Version};
     use image::{load_from_memory, Luma, Rgb};
-    use {EcLevel, QrCode, Version};
 
     #[test]
     fn test_annex_i_qr_as_image() {
@@ -347,8 +327,8 @@ mod image_tests {
 
 #[cfg(all(test, feature = "svg"))]
 mod svg_tests {
-    use render::svg::Color as SvgColor;
+    use crate::render::svg::Color as SvgColor;
-    use {EcLevel, QrCode, Version};
+    use crate::{EcLevel, QrCode, Version};
 
     #[test]
     fn test_annex_i_qr_as_svg() {

src/optimize.rs

@@ -1,9 +1,9 @@
 //! Find the optimal data mode sequence to encode a piece of data.
+use crate::types::{Mode, Version};
 use std::slice::Iter;
-use types::{Mode, Version};
 
 #[cfg(feature = "bench")]
-use test::Bencher;
+extern crate test;
 
 //------------------------------------------------------------------------------
 //{{{ Segment
@@ -153,8 +153,8 @@ impl<'a> Iterator for Parser<'a> {
 
 #[cfg(test)]
 mod parse_tests {
-    use optimize::{Parser, Segment};
+    use crate::optimize::{Parser, Segment};
-    use types::Mode;
+    use crate::types::Mode;
 
     fn parse(data: &[u8]) -> Vec<Segment> {
         Parser::new(data).collect()
@@ -249,7 +249,6 @@ mod parse_tests {
 //------------------------------------------------------------------------------
 //{{{ Optimizer
 
-#[cfg_attr(feature = "cargo-clippy", allow(stutter))] // rust-lang-nursery/rust-clippy#2212 ಠ_ಠ
 pub struct Optimizer<I> {
     parser: I,
     last_segment: Segment,
@@ -337,8 +336,8 @@ pub fn total_encoded_len(segments: &[Segment], version: Version) -> usize {
 
 #[cfg(test)]
 mod optimize_tests {
-    use optimize::{total_encoded_len, Optimizer, Segment};
+    use crate::optimize::{total_encoded_len, Optimizer, Segment};
-    use types::{Mode, Version};
+    use crate::types::{Mode, Version};
 
     fn test_optimization_result(given: Vec<Segment>, expected: Vec<Segment>, version: Version) {
         let prev_len = total_encoded_len(&*given, version);
@@ -455,8 +454,8 @@ mod optimize_tests {
 
 #[cfg(feature = "bench")]
 #[bench]
-fn bench_optimize(bencher: &mut Bencher) {
+fn bench_optimize(bencher: &mut test::Bencher) {
-    use types::Version;
+    use crate::types::Version;
 
     let data = b"QR\x83R\x81[\x83h\x81i\x83L\x83\x85\x81[\x83A\x81[\x83\x8b\x83R\x81[\x83h\x81j\
                  \x82\xc6\x82\xcd\x81A1994\x94N\x82\xc9\x83f\x83\x93\x83\\\x81[\x82\xcc\x8aJ\
@@ -532,14 +531,14 @@ impl ExclCharSet {
     /// Determines which character set a byte is in.
     fn from_u8(c: u8) -> Self {
         match c {
-            0x20 | 0x24 | 0x25 | 0x2a | 0x2b | 0x2d...0x2f | 0x3a => ExclCharSet::Symbol,
+            0x20 | 0x24 | 0x25 | 0x2a | 0x2b | 0x2d..=0x2f | 0x3a => ExclCharSet::Symbol,
-            0x30...0x39 => ExclCharSet::Numeric,
+            0x30..=0x39 => ExclCharSet::Numeric,
-            0x41...0x5a => ExclCharSet::Alpha,
+            0x41..=0x5a => ExclCharSet::Alpha,
-            0x81...0x9f => ExclCharSet::KanjiHi1,
+            0x81..=0x9f => ExclCharSet::KanjiHi1,
-            0xe0...0xea => ExclCharSet::KanjiHi2,
+            0xe0..=0xea => ExclCharSet::KanjiHi2,
             0xeb => ExclCharSet::KanjiHi3,
-            0x40 | 0x5b...0x7e | 0x80 | 0xa0...0xbf => ExclCharSet::KanjiLo1,
+            0x40 | 0x5b..=0x7e | 0x80 | 0xa0..=0xbf => ExclCharSet::KanjiLo1,
-            0xc0...0xdf | 0xec...0xfc => ExclCharSet::KanjiLo2,
+            0xc0..=0xdf | 0xec..=0xfc => ExclCharSet::KanjiLo2,
             _ => ExclCharSet::Byte,
         }
     }

src/render/image.rs

@@ -1,7 +1,7 @@
 #![cfg(feature="image")]
 
-use render::{Canvas, Pixel};
+use crate::render::{Canvas, Pixel};
-use types::Color;
+use crate::types::Color;
 
 use image::{ImageBuffer, Luma, LumaA, Pixel as ImagePixel, Primitive, Rgb, Rgba};
 
@@ -44,9 +44,9 @@ impl<P: ImagePixel + 'static> Canvas for (P, ImageBuffer<P, Vec<P::Subpixel>>) {
 
 #[cfg(test)]
 mod render_tests {
+    use crate::render::Renderer;
+    use crate::types::Color;
     use image::{Luma, Rgba};
-    use render::Renderer;
-    use types::Color;
 
     #[test]
     fn test_render_luma8_unsized() {
@@ -70,7 +70,7 @@ mod render_tests {
         .module_dimensions(1, 1)
         .build();
 
-        #[cfg_attr(rustfmt, rustfmt_skip)]
+        #[rustfmt::skip]
         let expected = [
             255, 255, 255, 255, 255,
             255, 255,   0,   0, 255,
@@ -87,7 +87,7 @@ mod render_tests {
             .module_dimensions(1, 1)
             .build();
 
-        #[cfg_attr(rustfmt, rustfmt_skip)]
+        #[rustfmt::skip]
         let expected: &[u8] = &[
             255,255,255,255, 255,255,255,255, 255,255,255,255, 255,255,255,255,
             255,255,255,255, 255,255,255,255,   0,  0,  0,255, 255,255,255,255,
@@ -104,7 +104,7 @@ mod render_tests {
             .min_dimensions(10, 10)
             .build();
 
-        #[cfg_attr(rustfmt, rustfmt_skip)]
+        #[rustfmt::skip]
         let expected: &[u8] = &[
             255,255,255, 255,255,255, 255,255,255, 255,255,255,
             255,255,255, 255,255,255, 255,255,255, 255,255,255,
@@ -133,7 +133,7 @@ mod render_tests {
             .max_dimensions(10, 5)
             .build();
 
-        #[cfg_attr(rustfmt, rustfmt_skip)]
+        #[rustfmt::skip]
         let expected: &[u8] = &[
             255,255, 255,255, 255,255, 255,255,
 

src/render/mod.rs

@@ -1,8 +1,8 @@
 //! Render a QR code into image.
 
-use cast::As;
+use crate::cast::As;
+use crate::types::Color;
 use std::cmp::max;
-use types::Color;
 
 pub mod image;
 pub mod string;
@@ -58,7 +58,6 @@ pub trait Canvas: Sized {
 
 /// A QR code renderer. This is a builder type which converts a bool-vector into
 /// an image.
-#[cfg_attr(feature = "cargo-clippy", allow(stutter))] // rust-lang-nursery/rust-clippy#2212 ಠ_ಠ
 pub struct Renderer<'a, P: Pixel> {
     content: &'a [Color],
     modules_count: u32, // <- we call it `modules_count` here to avoid ambiguity of `width`.

src/render/string.rs

@@ -1,8 +1,8 @@
 //! String rendering support.
 
-use cast::As;
+use crate::cast::As;
-use render::{Canvas as RenderCanvas, Pixel};
+use crate::render::{Canvas as RenderCanvas, Pixel};
-use types::Color;
+use crate::types::Color;
 
 pub trait Element: Copy {
     fn default_color(color: Color) -> Self;
@@ -99,7 +99,7 @@ impl<P: Element> RenderCanvas for Canvas<P> {
 
 #[test]
 fn test_render_to_string() {
-    use render::Renderer;
+    use crate::render::Renderer;
 
     let colors = &[Color::Dark, Color::Light, Color::Light, Color::Dark];
     let image: String = Renderer::<char>::new(colors, 2, 1).build();

src/render/svg.rs

@@ -3,24 +3,20 @@
 //! # Example
 //!
 //! ```
-//! extern crate qrcode;
-//!
 //! use qrcode::QrCode;
 //! use qrcode::render::svg;
 //!
-//! fn main() {
+//! let code = QrCode::new(b"Hello").unwrap();
-//!     let code = QrCode::new(b"Hello").unwrap();
+//! let svg_xml = code.render::<svg::Color>().build();
-//!     let svg_xml = code.render::<svg::Color>().build();
+//! println!("{}", svg_xml);
-//!     println!("{}", svg_xml);
-//! }
 
 #![cfg(feature="svg")]
 
 use std::fmt::Write;
 use std::marker::PhantomData;
 
-use render::{Canvas as RenderCanvas, Pixel};
+use crate::render::{Canvas as RenderCanvas, Pixel};
-use types::Color as ModuleColor;
+use crate::types::Color as ModuleColor;
 
 /// An SVG color.
 #[derive(Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]

src/types.rs

@@ -1,4 +1,4 @@
-use cast::As;
+use crate::cast::As;
 use std::cmp::{Ordering, PartialOrd};
 use std::default::Default;
 use std::fmt::{Display, Error, Formatter};
@@ -41,11 +41,7 @@ impl Display for QrError {
     }
 }
 
-impl ::std::error::Error for QrError {
+impl ::std::error::Error for QrError {}
-    fn description(&self) -> &'static str {
-        "QrError"
-    }
-}
 
 /// `QrResult` is a convenient alias for a QR code generation result.
 pub type QrResult<T> = Result<T, QrError>;
@@ -157,10 +153,10 @@ impl Version {
         T: PartialEq + Default + Copy,
     {
         match self {
-            Version::Normal(v @ 1...40) => {
+            Version::Normal(v @ 1..=40) => {
                 return Ok(table[(v - 1).as_usize()][ec_level as usize]);
             }
-            Version::Micro(v @ 1...4) => {
+            Version::Micro(v @ 1..=4) => {
                 let obj = table[(v + 39).as_usize()][ec_level as usize];
                 if obj != T::default() {
                     return Ok(obj);
@@ -228,12 +224,12 @@ impl Mode {
                     Mode::Kanji => a,
                 }
             }
-            Version::Normal(1...9) => match self {
+            Version::Normal(1..=9) => match self {
                 Mode::Numeric => 10,
                 Mode::Alphanumeric => 9,
                 Mode::Byte | Mode::Kanji => 8,
             },
-            Version::Normal(10...26) => match self {
+            Version::Normal(10..=26) => match self {
                 Mode::Numeric => 12,
                 Mode::Alphanumeric => 11,
                 Mode::Byte => 16,
@@ -305,7 +301,7 @@ impl PartialOrd for Mode {
 
 #[cfg(test)]
 mod mode_tests {
-    use types::Mode::{Alphanumeric, Byte, Kanji, Numeric};
+    use crate::types::Mode::{Alphanumeric, Byte, Kanji, Numeric};
 
     #[test]
     fn test_mode_order() {