From bd4f6f0b7d88baa9a5ecb18a2a700978ddcd58ff Mon Sep 17 00:00:00 2001
From: marmeladema <xademax@gmail.com>
Date: Sun, 21 Jun 2020 23:49:06 +0100
Subject: [PATCH] Move `next_disambiguator` to `Resolver`

---
 src/librustc_hir/definitions.rs | 12 ++----------
 src/librustc_resolve/lib.rs     | 14 +++++++++++++-
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/src/librustc_hir/definitions.rs b/src/librustc_hir/definitions.rs
index 5e072d37eaa..79b70682739 100644
--- a/src/librustc_hir/definitions.rs
+++ b/src/librustc_hir/definitions.rs
@@ -87,7 +87,6 @@ pub struct Definitions {
     parent_modules_of_macro_defs: FxHashMap<ExpnId, DefId>,
     /// Item with a given `LocalDefId` was defined during macro expansion with ID `ExpnId`.
     expansions_that_defined: FxHashMap<LocalDefId, ExpnId>,
-    next_disambiguator: FxHashMap<(LocalDefId, DefPathData), u32>,
 }
 
 /// A unique identifier that we can use to lookup a definition
@@ -350,7 +349,6 @@ pub fn new(crate_name: &str, crate_disambiguator: CrateDisambiguator) -> Definit
             def_id_to_hir_id: Default::default(),
             hir_id_to_def_id: Default::default(),
             expansions_that_defined: Default::default(),
-            next_disambiguator: Default::default(),
             parent_modules_of_macro_defs: Default::default(),
         }
     }
@@ -366,20 +364,14 @@ pub fn create_def(
         parent: LocalDefId,
         data: DefPathData,
         expn_id: ExpnId,
+        mut next_disambiguator: impl FnMut(LocalDefId, DefPathData) -> u32,
     ) -> LocalDefId {
         debug!("create_def(parent={:?}, data={:?}, expn_id={:?})", parent, data, expn_id);
 
         // The root node must be created with `create_root_def()`.
         assert!(data != DefPathData::CrateRoot);
 
-        // Find the next free disambiguator for this key.
-        let disambiguator = {
-            let next_disamb = self.next_disambiguator.entry((parent, data)).or_insert(0);
-            let disambiguator = *next_disamb;
-            *next_disamb = next_disamb.checked_add(1).expect("disambiguator overflow");
-            disambiguator
-        };
-
+        let disambiguator = next_disambiguator(parent, data);
         let key = DefKey {
             parent: Some(parent.local_def_index),
             disambiguated_data: DisambiguatedDefPathData { data, disambiguator },
diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs
index 6005f009cc3..ce068b8ac69 100644
--- a/src/librustc_resolve/lib.rs
+++ b/src/librustc_resolve/lib.rs
@@ -982,6 +982,8 @@ pub struct Resolver<'a> {
     /// When collecting definitions from an AST fragment produced by a macro invocation `ExpnId`
     /// we know what parent node that fragment should be attached to thanks to this table.
     invocation_parents: FxHashMap<ExpnId, LocalDefId>,
+
+    next_disambiguator: FxHashMap<(LocalDefId, DefPathData), u32>,
 }
 
 /// Nothing really interesting here; it just provides memory for the rest of the crate.
@@ -1142,7 +1144,16 @@ fn create_def(
             self.definitions.def_key(self.node_id_to_def_id[&node_id]),
         );
 
-        let def_id = self.definitions.create_def(parent, data, expn_id);
+        // Find the next free disambiguator for this key.
+        let next_disambiguator = &mut self.next_disambiguator;
+        let next_disambiguator = |parent, data| {
+            let next_disamb = next_disambiguator.entry((parent, data)).or_insert(0);
+            let disambiguator = *next_disamb;
+            *next_disamb = next_disamb.checked_add(1).expect("disambiguator overflow");
+            disambiguator
+        };
+
+        let def_id = self.definitions.create_def(parent, data, expn_id, next_disambiguator);
 
         assert_eq!(self.def_id_to_span.push(span), def_id);
 
@@ -1322,6 +1333,7 @@ pub fn new(
             def_id_to_node_id,
             placeholder_field_indices: Default::default(),
             invocation_parents,
+            next_disambiguator: Default::default(),
         }
     }
 
-- 
2.44.0