Help debug missing assembly

Author: alexcrichton

assert-instr/src/lib.rs

@@ -234,8 +234,18 @@ pub fn assert(fnptr: usize, expected: &str) {
     };
 
     // Find our function in the list of all disassembled functions
-    let functions = &DISASSEMBLY.get(&sym)
-        .expect(&format!("failed to find disassembly of {}", sym));
+    let functions = match DISASSEMBLY.get(&sym) {
+        Some(f) => f,
+        None => {
+            let parts = sym.split("::").collect::<Vec<_>>();
+            let part = parts.last().unwrap();
+            println!("maybe related functions");
+            for f in DISASSEMBLY.keys().filter(|k| k.contains(part)) {
+                println!("\t- {}", f);
+            }
+            panic!("failed to find disassembly of {}", sym);
+        }
+    };
     assert_eq!(functions.len(), 1);
     let function = &functions[0];