Save failed stack trace code for future reference.

kernel/src/lib.rs

@@ -1,5 +1,5 @@
 #![no_std]
-#![feature(abi_x86_interrupt)]
+#![feature(abi_x86_interrupt, breakpoint)]
 #![warn(
     clippy::correctness,
     clippy::nursery,
@@ -35,7 +35,6 @@ use crate::{
 use alloc::{boxed::Box, format};
 use core::arch::asm;
 use limine::BaseRevision;
-use std::{debug, unwind::UNWINDER};
 use x86_64::VirtAddr;
 
 pub mod arch;
@@ -83,6 +82,7 @@ impl core::error::Error for NoError {}
 /// Panicking before this is initialised is unwise. We should probably extract
 /// very early init into it's own function because Stack Traces may require
 /// allocations etc.
+#[inline(never)]
 pub fn boot() -> Result<(), Box<dyn core::error::Error>> {
     if !BASE_REVISION.is_supported() {
         return Err("Base revision not supported.".into());
@@ -149,10 +149,9 @@ pub fn boot() -> Result<(), Box<dyn core::error::Error>> {
     x86_64::instructions::interrupts::enable();
     debugln!("[Success]");
 
-    // Initialises the stack unwinder once and only once because this makes a
-    // heap allocation.
     debug!("    Initializing Stack Unwinder... ");
-    UNWINDER.lock();
+    // Force evaluate the constructor.
+    // let _unwinder = &*UNWINDER;
     debugln!("[Success]");
 
     Ok(())