abort() now takes a msg parameter

compiler/rustc_mir/src/const_eval/error.rs

@@ -20,6 +20,7 @@ pub enum ConstEvalErrKind {
     ModifiedGlobal,
     AssertFailure(AssertKind<ConstInt>),
     Panic { msg: Symbol, line: u32, col: u32, file: Symbol },
+    Abort(String),
 }
 
 // The errors become `MachineStop` with plain strings when being raised.
@@ -46,6 +47,7 @@ impl fmt::Display for ConstEvalErrKind {
             Panic { msg, line, col, file } => {
                 write!(f, "the evaluated program panicked at '{}', {}:{}:{}", msg, file, line, col)
             }
+            Abort(ref msg) => write!(f, "{}", msg)
         }
     }
 }

compiler/rustc_mir/src/interpret/intrinsics.rs

@@ -126,7 +126,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             None => match intrinsic_name {
                 sym::transmute => throw_ub_format!("transmuting to uninhabited type"),
                 sym::unreachable => throw_ub!(Unreachable),
-                sym::abort => M::abort(self)?,
+                sym::abort => M::abort(self, "aborted execution".to_owned())?,
                 // Unsupported diverging intrinsic.
                 _ => return Ok(false),
             },
@@ -412,7 +412,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let layout = self.layout_of(ty)?;
 
                 if layout.abi.is_uninhabited() {
-                    throw_ub_format!("attempted to instantiate uninhabited type `{}`", ty);
+                    M::abort(self, format!("attempted to instantiate uninhabited type `{}`", ty))?;
                 }
             }
             sym::simd_insert => {

compiler/rustc_mir/src/interpret/machine.rs

@@ -176,8 +176,10 @@ pub trait Machine<'mir, 'tcx>: Sized {
     ) -> InterpResult<'tcx>;
 
     /// Called to evaluate `Abort` MIR terminator.
-    fn abort(_ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx, !> {
-        throw_unsup_format!("aborting execution is not supported")
+    fn abort(_ecx: &mut InterpCx<'mir, 'tcx, Self>, msg: String) -> InterpResult<'tcx, !> {
+        use crate::const_eval::ConstEvalErrKind;
+
+        Err(ConstEvalErrKind::Abort(msg).into())
     }
 
     /// Called for all binary operations where the LHS has pointer type.

compiler/rustc_mir/src/interpret/terminator.rs

@@ -110,7 +110,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             }
 
             Abort => {
-                M::abort(self)?;
+                M::abort(self, "aborted execution".to_owned())?;
             }
 
             // When we encounter Resume, we've finished unwinding