this is the commit that gave the ICE.

Cargo.toml

@@ -10,11 +10,12 @@ edition = "2018"
 license = "Zlib OR Apache-2.0 OR MIT"
 
 [features]
-default = ["serial"]
+default = []
 serial = ["embedded-hal", "nb"]
 
 [dependencies]
 voladdress = { version = "0.4" }
+#
 embedded-hal = { version = "0.2.4", optional = true }
 nb = { version = "1", optional = true }
 

examples/irq.rs

@@ -2,7 +2,7 @@
 #![no_main]
 #![feature(isa_attribute)]
 
-use gba::{prelude::*, warn};
+use gba::prelude::*;
 
 const BLACK: Color = Color::from_rgb(0, 0, 0);
 const RED: Color = Color::from_rgb(31, 0, 0);
@@ -70,7 +70,6 @@ fn main() -> ! {
       flags = flags.with_timer1(true);
     }
 
-    warn!("IM = {:?}", flags);
     unsafe { IE.write(flags) };
 
     // Puts the CPU into low power mode until a VBlank IRQ is received. This

examples/test_savegame.rs

@@ -7,7 +7,7 @@
 // blue at the end.
 
 use core::cmp;
-use gba::{fatal, prelude::*, save::*, warn};
+use gba::prelude::*;
 
 fn set_screen_color(r: u8, g: u8, b: u8) {
   const SETTING: DisplayControl = DisplayControl::new().with_display_mode(3).with_display_bg2(true);
@@ -74,7 +74,7 @@ fn get_timer_secs() -> f32 {
 macro_rules! output {
   ($($args:tt)*) => {
     // we use warn so it shows by default on mGBA, nothing more.
-    warn!("{:7.3}\t{}", get_timer_secs(), format_args!($($args)*))
+    warning!("{:7.3}\t{}", get_timer_secs(), format_args!($($args)*))
   };
 }
 

src/debugging.rs

@@ -1,3 +1,5 @@
+#![allow(unused_macros)]
+
 //! Special utilities for debugging ROMs on various emulators.
 //!
 //! This is the underlying implementation behind the various print macros in
@@ -20,7 +22,6 @@ pub mod nocash;
 /// Furthermore on mGBA, there is a maximum length of 255 bytes per message.
 ///
 /// This has no effect outside of a supported emulator.
-#[macro_export]
 macro_rules! fatal {
   ($($arg:tt)*) => {{
     use $crate::debug;
@@ -30,6 +31,7 @@ macro_rules! fatal {
     debug::crash()
   }};
 }
+pub(crate) use fatal;
 
 /// Delivers a error message to the emulator debug output.
 ///
@@ -37,7 +39,6 @@ macro_rules! fatal {
 /// Furthermore on mGBA, there is a maximum length of 255 bytes per message.
 ///
 /// This has no effect outside of a supported emulator.
-#[macro_export]
 macro_rules! error {
   ($($arg:tt)*) => {{
     use $crate::debug;
@@ -46,6 +47,7 @@ macro_rules! error {
     }
   }};
 }
+pub(crate) use error;
 
 /// Delivers a warning message to the emulator debug output.
 ///
@@ -53,8 +55,7 @@ macro_rules! error {
 /// Furthermore on mGBA, there is a maximum length of 255 bytes per message.
 ///
 /// This has no effect outside of a supported emulator.
-#[macro_export]
+pub macro_rules! warning {
-macro_rules! warn {
   ($($arg:tt)*) => {{
     use $crate::debug;
     if !debug::is_debugging_disabled() {
@@ -62,6 +63,7 @@ macro_rules! warn {
     }
   }};
 }
+//pub(crate) use warning;
 
 /// Delivers an info message to the emulator debug output.
 ///
@@ -69,7 +71,6 @@ macro_rules! warn {
 /// Furthermore on mGBA, there is a maximum length of 255 bytes per message.
 ///
 /// This has no effect outside of a supported emulator.
-#[macro_export]
 macro_rules! info {
   ($($arg:tt)*) => {{
     use $crate::debug;
@@ -78,6 +79,7 @@ macro_rules! info {
     }
   }};
 }
+pub(crate) use info;
 
 /// Delivers a debug message to the emulator debug output.
 ///
@@ -85,7 +87,6 @@ macro_rules! info {
 /// Furthermore on mGBA, there is a maximum length of 255 bytes per message.
 ///
 /// This has no effect outside of a supported emulator.
-#[macro_export]
 macro_rules! debug {
   ($($arg:tt)*) => {{
     use $crate::debug;
@@ -94,6 +95,7 @@ macro_rules! debug {
     }
   }};
 }
+pub(crate) use debug;
 
 /// A cross-emulator debug level.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]

src/debugging/nocash.rs

@@ -4,10 +4,8 @@
 //! you've got some older version of things there might be any number of
 //! differences or problems.
 
-use crate::{
+use super::{DebugInterface, DebugLevel};
-  debug::{DebugInterface, DebugLevel},
+use crate::prelude::InitOnce;
-  sync::InitOnce,
-};
 use core::fmt::{Arguments, Write};
 use voladdress::*;
 

src/lib.rs

@@ -1,5 +1,5 @@
 #![no_std]
-#![feature(asm, global_asm, isa_attribute)]
+#![feature(asm, global_asm, pub_macro_rules, isa_attribute)]
 
 //! This crate helps you write GBA ROMs.
 //!
@@ -24,11 +24,18 @@
 pub mod prelude {
   pub use crate::mmio_types::*;
 
-  #[cfg(target_arch = "arm")]
-  pub use crate::mmio_addresses::*;
-
   #[cfg(target_arch = "arm")]
   pub use crate::bios::*;
+  #[cfg(target_arch = "arm")]
+  pub use crate::debugging::warning;
+  #[cfg(target_arch = "arm")]
+  pub use crate::debugging::*;
+  #[cfg(target_arch = "arm")]
+  pub use crate::mmio_addresses::*;
+  #[cfg(target_arch = "arm")]
+  pub use crate::save::*;
+  #[cfg(target_arch = "arm")]
+  pub use crate::sync::*;
 }
 
 pub mod mmio_types;
@@ -48,7 +55,7 @@ pub mod sync;
 pub mod save;
 
 #[cfg(target_arch = "arm")]
-pub mod debug;
+pub mod debugging;
 
 /*
 extern "C" {