Match ergonomics 2024: migration lint

Unfortunately, we can't always offer a machine-applicable suggestion when there are subpatterns from macro expansion.

Co-Authored-By: Guillaume Boisseau <Nadrieril@users.noreply.github.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/compiler/rustc_middle/src/ty/typeck_results.rs b/compiler/rustc_middle/src/ty/typeck_results.rs
index 41f417dfd4b..24e3e623ff2 100644
--- a/compiler/rustc_middle/src/ty/typeck_results.rs
+++ b/compiler/rustc_middle/src/ty/typeck_results.rs
@@ -79,6 +79,10 @@ pub struct TypeckResults<'tcx> {
     /// Stores the actual binding mode for all instances of [`BindingMode`].
     pat_binding_modes: ItemLocalMap<BindingMode>,
 
+    /// Top-level patterns whose match ergonomics need to be desugared
+    /// by the Rust 2021 -> 2024 migration lint.
+    rust_2024_migration_desugared_pats: ItemLocalSet,
+
     /// Stores the types which were implicitly dereferenced in pattern binding modes
     /// for later usage in THIR lowering. For example,
     ///
@@ -229,6 +233,7 @@ impl<'tcx> TypeckResults<'tcx> {
             adjustments: Default::default(),
             pat_binding_modes: Default::default(),
             pat_adjustments: Default::default(),
+            rust_2024_migration_desugared_pats: Default::default(),
             skipped_ref_pats: Default::default(),
             closure_kind_origins: Default::default(),
             liberated_fn_sigs: Default::default(),
@@ -432,6 +437,20 @@ impl<'tcx> TypeckResults<'tcx> {
         LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.pat_adjustments }
     }
 
+    pub fn rust_2024_migration_desugared_pats(&self) -> LocalSetInContext<'_> {
+        LocalSetInContext {
+            hir_owner: self.hir_owner,
+            data: &self.rust_2024_migration_desugared_pats,
+        }
+    }
+
+    pub fn rust_2024_migration_desugared_pats_mut(&mut self) -> LocalSetInContextMut<'_> {
+        LocalSetInContextMut {
+            hir_owner: self.hir_owner,
+            data: &mut self.rust_2024_migration_desugared_pats,
+        }
+    }
+
     pub fn skipped_ref_pats(&self) -> LocalSetInContext<'_> {
         LocalSetInContext { hir_owner: self.hir_owner, data: &self.skipped_ref_pats }
     }