Update compiler/rustc_const_eval/src/interpret/validity.rs

Co-authored-by: Ralf Jung <[email protected]>

Author: oli-obk

compiler/rustc_const_eval/src/interpret/validity.rs

@@ -1244,7 +1244,8 @@ impl<'rt, 'tcx, M: Machine<'tcx>> ValueVisitor<'tcx, M> for ValidityVisitor<'rt,
                 // When you extend this match, make sure to also add tests to
                 // tests/ui/type/pattern_types/validity.rs
                 match **pat {
-                    // Range patterns are handled fully by looking at the layout
+                    // Range patterns are precisely reflected into `valid_range` and thus
+                    // handled fully by `visit_scalar` (called below).
                     ty::PatternKind::Range { .. } => {},
                 }
             }