remove outdated comment in (inner) InferCtxt

compiler/rustc_infer/src/infer/mod.rs

@@ -131,23 +131,6 @@ pub struct InferCtxtInner<'tcx> {
     /// `$0: 'static`. This will get checked later by regionck. (We
     /// can't generally check these things right away because we have
     /// to wait until types are resolved.)
-    ///
-    /// These are stored in a map keyed to the id of the innermost
-    /// enclosing fn body / static initializer expression. This is
-    /// because the location where the obligation was incurred can be
-    /// relevant with respect to which sublifetime assumptions are in
-    /// place. The reason that we store under the fn-id, and not
-    /// something more fine-grained, is so that it is easier for
-    /// regionck to be sure that it has found *all* the region
-    /// obligations (otherwise, it's easy to fail to walk to a
-    /// particular node-id).
-    ///
-    /// Before running `resolve_regions_and_report_errors`, the creator
-    /// of the inference context is expected to invoke
-    /// [`InferCtxt::process_registered_region_obligations`]
-    /// for each body-id in this map, which will process the
-    /// obligations within. This is expected to be done 'late enough'
-    /// that all type inference variables have been bound and so forth.
     region_obligations: Vec<TypeOutlivesConstraint<'tcx>>,
 
     /// The outlives bounds that we assume must hold about placeholders that

compiler/rustc_trait_selection/src/regions.rs

@@ -77,6 +77,8 @@ impl<'tcx> InferCtxt<'tcx> {
     ///
     /// Prefer this method over `resolve_regions_with_normalize`, unless you are
     /// doing something specific for normalization.
+    ///
+    /// This function assumes that all infer variables are already constrained.
     fn resolve_regions(
         &self,
         body_id: LocalDefId,