also indicate abort via new MachineStop variant

src/eval.rs

@@ -212,7 +212,7 @@ pub fn eval_main<'tcx>(tcx: TyCtxt<'tcx>, main_id: DefId, config: MiriConfig) ->
                     match info {
                         TerminationInfo::Exit(code) => return Some(*code),
                         TerminationInfo::Abort =>
-                            format!("The program aborted execution")
+                            format!("the evaluated program aborted execution")
                     }
                 }
                 err_unsup!(NoMirFor(..)) =>

src/shims/intrinsics.rs

@@ -34,9 +34,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         // Handle diverging intrinsics.
         let (dest, ret) = match intrinsic_name {
             "abort" => {
-                // FIXME: Add a better way of indicating 'abnormal' termination,
-                // since this is not really an 'unsupported' behavior
-                throw_unsup_format!("the evaluated program aborted!");
+                let ti = Box::new(TerminationInfo::Abort);
+                return Err(InterpError::MachineStop(ti).into());
             }
             "miri_start_panic" => return this.handle_miri_start_panic(args, unwind),
             _ => {

tests/compile-fail/double_panic.rs

@@ -1,4 +1,4 @@
- //error-pattern: the evaluated program aborted
+ // error-pattern: the evaluated program aborted
 struct Foo;
 impl Drop for Foo {
     fn drop(&mut self) {