Don't abort const eval due to long running evals, just warn

src/librustc/ich/impls_ty.rs

@@ -550,7 +550,6 @@ for ::mir::interpret::EvalError<'gcx> {
             InvalidPointerMath |
             ReadUndefBytes |
             DeadLocal |
-            ExecutionTimeLimitReached |
             StackFrameLimitReached |
             OutOfTls |
             TlsOutOfBounds |

src/librustc/mir/interpret/error.rs

@@ -65,7 +65,6 @@ pub enum EvalErrorKind<'tcx> {
     Intrinsic(String),
     OverflowingMath,
     InvalidChar(u128),
-    ExecutionTimeLimitReached,
     StackFrameLimitReached,
     OutOfTls,
     TlsOutOfBounds,
@@ -188,8 +187,6 @@ impl<'tcx> Error for EvalError<'tcx> {
                 "mir not found",
             InvalidChar(..) =>
                 "tried to interpret an invalid 32-bit value as a char",
-            ExecutionTimeLimitReached =>
-                "the expression was too complex to be evaluated or resulted in an infinite loop",
             StackFrameLimitReached =>
                 "reached the configured maximum number of stack frames",
             OutOfTls =>

src/librustc/session/mod.rs

@@ -112,8 +112,6 @@ pub struct Session {
 
     /// The maximum number of stackframes allowed in const eval
     pub const_eval_stack_frame_limit: usize,
-    /// The maximum number miri steps per constant
-    pub const_eval_step_limit: usize,
 
     /// The metadata::creader module may inject an allocator/panic_runtime
     /// dependency if it didn't already find one, and this tracks what was
@@ -1103,7 +1101,6 @@ pub fn build_session_(
         recursion_limit: Once::new(),
         type_length_limit: Once::new(),
         const_eval_stack_frame_limit: 100,
-        const_eval_step_limit: 1_000_000,
         next_node_id: OneThread::new(Cell::new(NodeId::new(1))),
         injected_allocator: Once::new(),
         allocator_kind: Once::new(),

src/librustc/ty/structural_impls.rs

@@ -509,7 +509,6 @@ impl<'a, 'tcx> Lift<'tcx> for interpret::EvalError<'a> {
             Intrinsic(ref s) => Intrinsic(s.clone()),
             OverflowingMath => OverflowingMath,
             InvalidChar(c) => InvalidChar(c),
-            ExecutionTimeLimitReached => ExecutionTimeLimitReached,
             StackFrameLimitReached => StackFrameLimitReached,
             OutOfTls => OutOfTls,
             TlsOutOfBounds => TlsOutOfBounds,