Consistently use Self as return type

src/chip8/display.rs

@@ -9,7 +9,7 @@ pub struct Screen {
 }
 
 impl Screen {
-    pub fn new() -> Screen {
+    pub fn new() -> Self {
         Screen {
             pixels: [[false; WIDTH]; HEIGHT],
         }

src/chip8/emulator.rs

@@ -19,7 +19,7 @@ pub struct Chip8 {
 }
 
 impl Chip8 {
-    pub fn new(audio_subsystem: &AudioSubsystem) -> Chip8 {
+    pub fn new(audio_subsystem: &AudioSubsystem) -> Self {
         Chip8 {
             memory: Memory::new(),
             registers: Registers::new(),

src/chip8/keyboard.rs

@@ -7,7 +7,7 @@ pub struct Keyboard {
 }
 
 impl Keyboard {
-    pub fn new() -> Keyboard {
+    pub fn new() -> Self {
         Keyboard {
             keyboard: [false; KEYS],
         }

src/chip8/memory.rs

@@ -35,7 +35,7 @@ fn copy_default_char_set(memory: &mut Memory) {
 }
 
 impl Memory {
-    pub fn new() -> Memory {
+    pub fn new() -> Self {
         let mut memory = Memory {
             memory: [0; MEMORY_SIZE],
         };

src/chip8/registers.rs

@@ -60,7 +60,7 @@ pub struct Registers {
 }
 
 impl Registers {
-    pub fn new() -> Registers {
+    pub fn new() -> Self {
         Registers {
             data: [0; DATA_REGISTERS],
             i: 0,

src/chip8/stack.rs

@@ -5,7 +5,7 @@ pub struct Stack {
 }
 
 impl Stack {
-    pub fn new() -> Stack {
+    pub fn new() -> Self {
         Stack {
             stack: [0; STACK_DEPTH],
         }