chore: update error messages in expect() calls

src/instruction.rs

@@ -2277,13 +2277,13 @@ impl From<Cycle> for u32 {
 
 impl InstrRegisterPair {
     fn to_register_pair(self) -> RegisterPair {
-        RegisterPair::try_from(self).expect("Failed to convert InstrRegisterPair to RegisterPair")
+        RegisterPair::try_from(self).expect("InstrRegisterPair is a valid RegisterPair")
     }
 }
 
 impl InstrRegister {
     fn to_register(self) -> Register {
-        Register::try_from(self).expect("Failed to convert from InstrRegister to Register")
+        Register::try_from(self).expect("InstrRegister is a valid Register")
     }
 }
 

src/main.rs

@@ -39,14 +39,16 @@ fn main() -> Result<()> {
 
     // `rom` is a required value in every situation so this will
     // always exist.
-    let rom_path = m.value_of("rom").unwrap();
+    let rom_path = m
+        .value_of("rom")
+        .expect("Required value 'rom' was provided");
 
     let mut game_boy =
-        gb::emu::init(m.value_of("boot"), rom_path).expect("Failed to initialize DMG-01 Emulator");
+        gb::emu::init(m.value_of("boot"), rom_path).expect("Initialized DMG-01 Emulator");
     let cartridge_title = gb::emu::rom_title(&game_boy);
 
     // Initialize Gamepad Support
-    let mut gamepad = Gilrs::new().expect("Failed to initialize Gilrs");
+    let mut gamepad = Gilrs::new().expect("Initialized Gilrs for Controller Input");
 
     // Initialize GUI
     let event_loop = EventLoop::new();

src/ppu.rs

@@ -278,7 +278,7 @@ impl Ppu {
                         .obj
                         .tile
                         .bytes()
-                        .expect("Failed to unwrap Tile bytes");
+                        .expect("Tile high & low bytes are present");
 
                     let tbpp = Pixels::from_bytes(high, low);
 
@@ -539,7 +539,7 @@ impl ObjectAttributeTable {
 
         let slice: &[u8; 4] = self.buf[start..(start + 4)]
             .try_into()
-            .expect("Could not interpret &[u8] as a &[u8; 4]");
+            .expect("TryInto trait called on a &[u8; 4]");
 
         slice.into()
     }
@@ -704,7 +704,7 @@ impl PixelFetcher {
         let scroll_y = pos.scroll_y;
         let is_window = self.back.is_window_tile();
 
-        let id = self.back.tile.id.expect("Tile Number unexpectedly missing");
+        let id = self.back.tile.id.expect("Tile Number is present");
 
         let tile_data_addr = match control.tile_data_addr() {
             TileDataAddress::X8800 => 0x9000u16.wrapping_add(((id as i8) as i16 * 16) as u16),
@@ -721,7 +721,11 @@ impl PixelFetcher {
     }
 
     fn send_to_fifo(&self, fifo: &mut FifoRenderer, palette: &BackgroundPalette) {
-        let (high, low) = self.back.tile.bytes().expect("Failed to unwrap Tile bytes");
+        let (high, low) = self
+            .back
+            .tile
+            .bytes()
+            .expect("Tile high & low bytes are present");
 
         let tbpp = Pixels::from_bytes(high, low);
 

src/ppu/dma.rs

@@ -30,7 +30,7 @@ impl DirectMemoryAccess {
                     .start
                     .addr
                     .as_mut()
-                    .expect("DMA Transfer Attempted without a known source address");
+                    .expect("Source Address present during DMA Transfer");
 
                 let addresses = if (self.cycle - 4) % 4 == 0 {
                     *src_addr += 1;