diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src/solve/mod.rs')
| -rw-r--r-- | compiler/rustc_trait_selection/src/solve/mod.rs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/solve/mod.rs b/compiler/rustc_trait_selection/src/solve/mod.rs index 51094b781c0..0bf28f520a4 100644 --- a/compiler/rustc_trait_selection/src/solve/mod.rs +++ b/compiler/rustc_trait_selection/src/solve/mod.rs @@ -42,6 +42,17 @@ pub use fulfill::FulfillmentCtxt; pub(crate) use normalize::deeply_normalize_for_diagnostics; pub use normalize::{deeply_normalize, deeply_normalize_with_skipped_universes}; +/// How many fixpoint iterations we should attempt inside of the solver before bailing +/// with overflow. +/// +/// We previously used `tcx.recursion_limit().0.checked_ilog2().unwrap_or(0)` for this. +/// However, it feels unlikely that uncreasing the recursion limit by a power of two +/// to get one more itereation is every useful or desirable. We now instead used a constant +/// here. If there ever ends up some use-cases where a bigger number of fixpoint iterations +/// is required, we can add a new attribute for that or revert this to be dependant on the +/// recursion limit again. However, this feels very unlikely. +const FIXPOINT_STEP_LIMIT: usize = 8; + #[derive(Debug, Clone, Copy)] enum SolverMode { /// Ordinary trait solving, using everywhere except for coherence. |