diff --git a/artiq/firmware/Cargo.lock b/artiq/firmware/Cargo.lock
index d4c926fef..dfddf22e7 100644
--- a/artiq/firmware/Cargo.lock
+++ b/artiq/firmware/Cargo.lock
@@ -21,6 +21,7 @@ dependencies = [
 name = "board"
 version = "0.0.0"
 dependencies = [
+ "build_artiq 0.0.0",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/artiq/firmware/liballoc_list/lib.rs b/artiq/firmware/liballoc_list/lib.rs
index 8958c1bce..4854575bb 100644
--- a/artiq/firmware/liballoc_list/lib.rs
+++ b/artiq/firmware/liballoc_list/lib.rs
@@ -104,19 +104,17 @@ unsafe impl<'a> Alloc for &'a ListAlloc {
     }
 
     fn oom(&mut self, err: AllocErr) -> ! {
-        panic!("cannot allocate: {:?}", err)
+        panic!("heap view: {}\ncannot allocate: {:?}", self, err)
     }
 }
 
-impl ListAlloc {
-    pub fn debug_dump(&self, f: &mut fmt::Write) -> fmt::Result {
+impl fmt::Display for ListAlloc {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         unsafe {
             let mut total_busy = 0;
             let mut total_idle = 0;
             let mut total_meta = 0;
 
-            write!(f, "Heap view:\n")?;
-
             let mut curr = self.root;
             while !curr.is_null() {
                 total_meta += mem::size_of::<Header>();