distinguish recursion limit based overflow for diagnostics

also change the number of allowed fixpoint steps to be fixed instead
of using the `log` of the total recursion depth.

compiler/rustc_infer/src/traits/mod.rs

@@ -135,16 +135,18 @@ pub struct FulfillmentError<'tcx> {
 
 #[derive(Clone)]
 pub enum FulfillmentErrorCode<'tcx> {
-    /// Inherently impossible to fulfill; this trait is implemented if and only if it is already implemented.
+    /// Inherently impossible to fulfill; this trait is implemented if and only
+    /// if it is already implemented.
     Cycle(Vec<PredicateObligation<'tcx>>),
     SelectionError(SelectionError<'tcx>),
     ProjectionError(MismatchedProjectionTypes<'tcx>),
     SubtypeError(ExpectedFound<Ty<'tcx>>, TypeError<'tcx>), // always comes from a SubtypePredicate
     ConstEquateError(ExpectedFound<Const<'tcx>>, TypeError<'tcx>),
     Ambiguity {
-        /// Overflow reported from the new solver `-Znext-solver`, which will
-        /// be reported as an regular error as opposed to a fatal error.
-        overflow: bool,
+        /// Overflow is only `Some(suggest_recursion_limit)` when using the next generation
+        /// trait solver `-Znext-solver`. With the old solver overflow is eagerly handled by
+        /// emitting a fatal error instead.
+        overflow: Option<bool>,
     },
 }
 

compiler/rustc_infer/src/traits/structural_impls.rs

@@ -47,8 +47,10 @@ impl<'tcx> fmt::Debug for traits::FulfillmentErrorCode<'tcx> {
             ConstEquateError(ref a, ref b) => {
                 write!(f, "CodeConstEquateError({a:?}, {b:?})")
             }
-            Ambiguity { overflow: false } => write!(f, "Ambiguity"),
-            Ambiguity { overflow: true } => write!(f, "Overflow"),
+            Ambiguity { overflow: None } => write!(f, "Ambiguity"),
+            Ambiguity { overflow: Some(suggest_increasing_limit) } => {
+                write!(f, "Overflow({suggest_increasing_limit})")
+            }
             Cycle(ref cycle) => write!(f, "Cycle({cycle:?})"),
         }
     }