Repository: rust-lang/rust-analyzer
Pull request #16822 (2024-03-12 14:48:57)

fix: Make inlay hint resolving work better for inlays targetting the same position


Patch:
diff --git a/crates/hir-ty/src/lower.rs b/crates/hir-ty/src/lower.rs
index 3e6d81f6ca..dac20f2259 100644
--- a/crates/hir-ty/src/lower.rs
+++ b/crates/hir-ty/src/lower.rs
@@ -1107,12 +1107,8 @@ impl<'a> TyLoweringContext<'a> {
                     binding.type_ref.as_ref().map_or(0, |_| 1) + binding.bounds.len(),
                 );
                 if let Some(type_ref) = &binding.type_ref {
-                    if let (
-                        TypeRef::ImplTrait(bounds),
-                        ImplTraitLoweringState::Param(_)
-                        | ImplTraitLoweringState::Variable(_)
-                        | ImplTraitLoweringState::Disallowed,
-                    ) = (type_ref, &self.impl_trait_mode)
+                    if let (TypeRef::ImplTrait(bounds), ImplTraitLoweringState::Disallowed) =
+                        (type_ref, &self.impl_trait_mode)
                     {
                         for bound in bounds {
                             predicates.extend(
diff --git a/crates/ide/src/inlay_hints.rs b/crates/ide/src/inlay_hints.rs
index 8311e770b4..dda38ce77e 100644
--- a/crates/ide/src/inlay_hints.rs
+++ b/crates/ide/src/inlay_hints.rs
@@ -1,5 +1,6 @@
 use std::{
     fmt::{self, Write},
+    hash::{BuildHasher, BuildHasherDefault},
     mem::take,
 };
 
@@ -8,7 +9,7 @@ use hir::{
     known, ClosureStyle, HasVisibility, HirDisplay, HirDisplayError, HirWrite, ModuleDef,
     ModuleDefId, Semantics,
 };
-use ide_db::{base_db::FileRange, famous_defs::FamousDefs, RootDatabase};
+use ide_db::{base_db::FileRange, famous_defs::FamousDefs, FxHasher, RootDatabase};
 use itertools::Itertools;
 use smallvec::{smallvec, SmallVec};
 use stdx::never;
@@ -116,7 +117,7 @@ pub enum AdjustmentHintsMode {
     PreferPostfix,
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 pub enum InlayKind {
     Adjustment,
     BindingMode,
@@ -132,7 +133,7 @@ pub enum InlayKind {
     RangeExclusive,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Hash)]
 pub enum InlayHintPosition {
     Before,
     After,
@@ -151,13 +152,23 @@ pub struct InlayHint {
     pub label: InlayHintLabel,
     /// Text edit to apply when "accepting" this inlay hint.
     pub text_edit: Option<TextEdit>,
-    pub needs_resolve: bool,
+}
+
+impl std::hash::Hash for InlayHint {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.range.hash(state);
+        self.position.hash(state);
+        self.pad_left.hash(state);
+        self.pad_right.hash(state);
+        self.kind.hash(state);
+        self.label.hash(state);
+        self.text_edit.is_some().hash(state);
+    }
 }
 
 impl InlayHint {
     fn closing_paren_after(kind: InlayKind, range: TextRange) -> InlayHint {
         InlayHint {
-            needs_resolve: false,
             range,
             kind,
             label: InlayHintLabel::from(")"),
@@ -167,9 +178,9 @@ impl InlayHint {
             pad_right: false,
         }
     }
+
     fn opening_paren_before(kind: InlayKind, range: TextRange) -> InlayHint {
         InlayHint {
-            needs_resolve: false,
             range,
             kind,
             label: InlayHintLabel::from("("),
@@ -179,15 +190,19 @@ impl InlayHint {
             pad_right: false,
         }
     }
+
+    pub fn needs_resolve(&self) -> bool {
+        self.text_edit.is_some() || self.label.needs_resolve()
+    }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Hash)]
 pub enum InlayTooltip {
     String(String),
     Markdown(String),
 }
 
-#[derive(Default)]
+#[derive(Default, Hash)]
 pub struct InlayHintLabel {
     pub parts: SmallVec<[InlayHintLabelPart; 1]>,
 }
@@ -265,6 +280,7 @@ impl fmt::Debug for InlayHintLabel {
     }
 }
 
+#[derive(Hash)]
 pub struct InlayHintLabelPart {
     pub text: String,
     /// Source location represented by this label part. The client will use this to fetch the part's
@@ -313,9 +329,7 @@ impl fmt::Write for InlayHintLabelBuilder<'_> {
 
 impl HirWrite for InlayHintLabelBuilder<'_> {
     fn start_location_link(&mut self, def: ModuleDefId) {
-        if self.location.is_some() {
-            never!("location link is already started");
-        }
+        never!(self.location.is_some(), "location link is already started");
         self.make_new_part();
         let Some(location) = ModuleDef::from(def).try_to_nav(self.db) else { return };
         let location = location.call_site();
@@ -425,11 +439,6 @@ fn ty_to_text_edit(
     Some(builder.finish())
 }
 
-pub enum RangeLimit {
-    Fixed(TextRange),
-    NearestParent(TextSize),
-}
-
 // Feature: Inlay Hints
 //
 // rust-analyzer shows additional information inline with the source code.
@@ -451,7 +460,7 @@ pub enum RangeLimit {
 pub(crate) fn inlay_hints(
     db: &RootDatabase,
     file_id: FileId,
-    range_limit: Option<RangeLimit>,
+    range_limit: Option<TextRange>,
     config: &InlayHintsConfig,
 ) -> Vec<InlayHint> {
     let _p = tracing::span!(tracing::Level::INFO, "inlay_hints").entered();
@@ -466,31 +475,13 @@ pub(crate) fn inlay_hints(
 
         let hints = |node| hints(&mut acc, &famous_defs, config, file_id, node);
         match range_limit {
-            Some(RangeLimit::Fixed(range)) => match file.covering_element(range) {
+            Some(range) => match file.covering_element(range) {
                 NodeOrToken::Token(_) => return acc,
                 NodeOrToken::Node(n) => n
                     .descendants()
                     .filter(|descendant| range.intersect(descendant.text_range()).is_some())
                     .for_each(hints),
             },
-            Some(RangeLimit::NearestParent(position)) => {
-                match file.token_at_offset(position).left_biased() {
-                    Some(token) => {
-                        if let Some(parent_block) =
-                            token.parent_ancestors().find_map(ast::BlockExpr::cast)
-                        {
-                            parent_block.syntax().descendants().for_each(hints)
-                        } else if let Some(parent_item) =
-                            token.parent_ancestors().find_map(ast::Item::cast)
-                        {
-                            parent_item.syntax().descendants().for_each(hints)
-                        } else {
-                            return acc;
-                        }
-                    }
-                    None => return acc,
-                }
-            }
             None => file.descendants().for_each(hints),
         };
     }
@@ -498,6 +489,39 @@ pub(crate) fn inlay_hints(
     acc
 }
 
+pub(crate) fn inlay_hints_resolve(
+    db: &RootDatabase,
+    file_id: FileId,
+    position: TextSize,
+    hash: u64,
+    config: &InlayHintsConfig,
+) -> Option<InlayHint> {
+    let _p = tracing::span!(tracing::Level::INFO, "inlay_hints").entered();
+    let sema = Semantics::new(db);
+    let file = sema.parse(file_id);
+    let file = file.syntax();
+
+    let scope = sema.scope(file)?;
+    let famous_defs = FamousDefs(&sema, scope.krate());
+    let mut acc = Vec::new();
+
+    let hints = |node| hints(&mut acc, &famous_defs, config, file_id, node);
+    match file.token_at_offset(position).left_biased() {
+        Some(token) => {
+            if let Some(parent_block) = token.parent_ancestors().find_map(ast::BlockExpr::cast) {
+                parent_block.syntax().descendants().for_each(hints)
+            } else if let Some(parent_item) = token.parent_ancestors().find_map(ast::Item::cast) {
+                parent_item.syntax().descendants().for_each(hints)
+            } else {
+                return None;
+            }
+        }
+        None => return None,
+    }
+
+    acc.into_iter().find(|hint| BuildHasherDefault::<FxHasher>::default().hash_one(hint) == hash)
+}
+
 fn hints(
     hints: &mut Vec<InlayHint>,
     famous_defs @ FamousDefs(sema, _): &FamousDefs<'_, '_>,
diff --git a/crates/ide/src/inlay_hints/adjustment.rs b/crates/ide/src/inlay_hints/adjustment.rs
index 631807d99a..20128a286f 100644
--- a/crates/ide/src/inlay_hints/adjustment.rs
+++ b/crates/ide/src/inlay_hints/adjustment.rs
@@ -147,7 +147,6 @@ pub(super) fn hints(
             None,
         );
         acc.push(InlayHint {
-            needs_resolve: label.needs_resolve(),
             range: expr.syntax().text_range(),
             pad_left: false,
             pad_right: false,
diff --git a/crates/ide/src/inlay_hints/bind_pat.rs b/crates/ide/src/inlay_hints/bind_pat.rs
index 45b51e3557..07b9f9cc1f 100644
--- a/crates/ide/src/inlay_hints/bind_pat.rs
+++ b/crates/ide/src/inlay_hints/bind_pat.rs
@@ -99,7 +99,6 @@ pub(super) fn hints(
         None => pat.syntax().text_range(),
     };
     acc.push(InlayHint {
-        needs_resolve: label.needs_resolve() || text_edit.is_some(),
         range: match type_ascriptable {
             Some(Some(t)) => text_range.cover(t.text_range()),
             _ => text_range,
@@ -177,11 +176,7 @@ mod tests {
     use syntax::{TextRange, TextSize};
     use test_utils::extract_annotations;
 
-    use crate::{
-        fixture,
-        inlay_hints::{InlayHintsConfig, RangeLimit},
-        ClosureReturnTypeHints,
-    };
+    use crate::{fixture, inlay_hints::InlayHintsConfig, ClosureReturnTypeHints};
 
     use crate::inlay_hints::tests::{
         check, check_edit, check_no_edit, check_with_config, DISABLED_CONFIG, TEST_CONFIG,
@@ -404,7 +399,7 @@ fn main() {
             .inlay_hints(
                 &InlayHintsConfig { type_hints: true, ..DISABLED_CONFIG },
                 file_id,
-                Some(RangeLimit::Fixed(TextRange::new(TextSize::from(500), TextSize::from(600)))),
+                Some(TextRange::new(TextSize::from(500), TextSize::from(600))),
             )
             .unwrap();
         let actual =
diff --git a/crates/ide/src/inlay_hints/binding_mode.rs b/crates/ide/src/inlay_hints/binding_mode.rs
index 35504ffa78..f27390ee89 100644
--- a/crates/ide/src/inlay_hints/binding_mode.rs
+++ b/crates/ide/src/inlay_hints/binding_mode.rs
@@ -50,7 +50,6 @@ pub(super) fn hints(
             _ => return,
         };
         acc.push(InlayHint {
-            needs_resolve: false,
             range,
             kind: InlayKind::BindingMode,
             label: r.into(),
@@ -69,7 +68,6 @@ pub(super) fn hints(
                 hir::BindingMode::Ref(Mutability::Shared) => "ref",
             };
             acc.push(InlayHint {
-                needs_resolve: false,
                 range: pat.syntax().text_range(),
                 kind: InlayKind::BindingMode,
                 label: bm.into(),
diff --git a/crates/ide/src/inlay_hints/chaining.rs b/crates/ide/src/inlay_hints/chaining.rs
index b6063978e9..d86487d4b4 100644
--- a/crates/ide/src/inlay_hints/chaining.rs
+++ b/crates/ide/src/inlay_hints/chaining.rs
@@ -59,7 +59,6 @@ pub(super) fn hints(
             }
             let label = label_of_ty(famous_defs, config, &ty)?;
             acc.push(InlayHint {
-                needs_resolve: label.needs_resolve(),
                 range: expr.syntax().text_range(),
                 kind: InlayKind::Chaining,
                 label,
diff --git a/crates/ide/src/inlay_hints/closing_brace.rs b/crates/ide/src/inlay_hints/closing_brace.rs
index 2b68538c19..2cefd5acdc 100644
--- a/crates/ide/src/inlay_hints/closing_brace.rs
+++ b/crates/ide/src/inlay_hints/closing_brace.rs
@@ -109,7 +109,6 @@ pub(super) fn hints(
 
     let linked_location = name_range.map(|range| FileRange { file_id, range });
     acc.push(InlayHint {
-        needs_resolve: linked_location.is_some(),
         range: closing_token.text_range(),
         kind: InlayKind::ClosingBrace,
         label: InlayHintLabel::simple(label, None, linked_location),
diff --git a/crates/ide/src/inlay_hints/closure_captures.rs b/crates/ide/src/inlay_hints/closure_captures.rs
index 2f8b959516..f1b524e088 100644
--- a/crates/ide/src/inlay_hints/closure_captures.rs
+++ b/crates/ide/src/inlay_hints/closure_captures.rs
@@ -32,7 +32,6 @@ pub(super) fn hints(
             let range = closure.syntax().first_token()?.prev_token()?.text_range();
             let range = TextRange::new(range.end() - TextSize::from(1), range.end());
             acc.push(InlayHint {
-                needs_resolve: false,
                 range,
                 kind: InlayKind::ClosureCapture,
                 label: InlayHintLabel::from("move"),
@@ -45,7 +44,6 @@ pub(super) fn hints(
         }
     };
     acc.push(InlayHint {
-        needs_resolve: false,
         range: move_kw_range,
         kind: InlayKind::ClosureCapture,
         label: InlayHintLabel::from("("),
@@ -79,7 +77,6 @@ pub(super) fn hints(
             }),
         );
         acc.push(InlayHint {
-            needs_resolve: label.needs_resolve(),
             range: move_kw_range,
             kind: InlayKind::ClosureCapture,
             label,
@@ -91,7 +88,6 @@ pub(super) fn hints(
 
         if idx != last {
             acc.push(InlayHint {
-                needs_resolve: false,
                 range: move_kw_range,
                 kind: InlayKind::ClosureCapture,
                 label: InlayHintLabel::from(", "),
@@ -103,7 +99,6 @@ pub(super) fn hints(
         }
     }
     acc.push(InlayHint {
-        needs_resolve: false,
         range: move_kw_range,
         kind: InlayKind::ClosureCapture,
         label: InlayHintLabel::from(")"),
diff --git a/crates/ide/src/inlay_hints/closure_ret.rs b/crates/ide/src/inlay_hints/closure_ret.rs
index 204967cd7c..3b41db0f13 100644
--- a/crates/ide/src/inlay_hints/closure_ret.rs
+++ b/crates/ide/src/inlay_hints/closure_ret.rs
@@ -64,7 +64,6 @@ pub(super) fn hints(
     };
 
     acc.push(InlayHint {
-        needs_resolve: label.needs_resolve() || text_edit.is_some(),
         range: param_list.syntax().text_range(),
         kind: InlayKind::Type,
         label,
diff --git a/crates/ide/src/inlay_hints/discriminant.rs b/crates/ide/src/inlay_hints/discriminant.rs
index 06cce147d2..202954100f 100644
--- a/crates/ide/src/inlay_hints/discriminant.rs
+++ b/crates/ide/src/inlay_hints/discriminant.rs
@@ -79,7 +79,6 @@ fn variant_hints(
         None,
     );
     acc.push(InlayHint {
-        needs_resolve: label.needs_resolve(),
         range: match eq_token {
             Some(t) => range.cover(t.text_range()),
             _ => range,
diff --git a/crates/ide/src/inlay_hints/fn_lifetime_fn.rs b/crates/ide/src/inlay_hints/fn_lifetime_fn.rs
index 6e5f23bed0..d3666754e2 100644
--- a/crates/ide/src/inlay_hints/fn_lifetime_fn.rs
+++ b/crates/ide/src/inlay_hints/fn_lifetime_fn.rs
@@ -22,7 +22,6 @@ pub(super) fn hints(
     }
 
     let mk_lt_hint = |t: SyntaxToken, label: String| InlayHint {
-        needs_resolve: false,
         range: t.text_range(),
         kind: InlayKind::Lifetime,
         label: label.into(),
@@ -184,7 +183,6 @@ pub(super) fn hints(
             let angle_tok = gpl.l_angle_token()?;
             let is_empty = gpl.generic_params().next().is_none();
             acc.push(InlayHint {
-                needs_resolve: false,
                 range: angle_tok.text_range(),
                 kind: InlayKind::Lifetime,
                 label: format!(
@@ -200,7 +198,6 @@ pub(super) fn hints(
             });
         }
         (None, allocated_lifetimes) => acc.push(InlayHint {
-            needs_resolve: false,
             range: func.name()?.syntax().text_range(),
             kind: InlayKind::GenericParamList,
             label: format!("<{}>", allocated_lifetimes.iter().format(", "),).into(),
diff --git a/crates/ide/src/inlay_hints/implicit_drop.rs b/crates/ide/src/inlay_hints/implicit_drop.rs
index 5ba4e514e1..31f0c79037 100644
--- a/crates/ide/src/inlay_hints/implicit_drop.rs
+++ b/crates/ide/src/inlay_hints/implicit_drop.rs
@@ -105,7 +105,6 @@ pub(super) fn hints(
                 pad_left: true,
                 pad_right: true,
                 kind: InlayKind::Drop,
-                needs_resolve: label.needs_resolve(),
                 label,
                 text_edit: None,
             })
diff --git a/crates/ide/src/inlay_hints/implicit_static.rs b/crates/ide/src/inlay_hints/implicit_static.rs
index f18e6421cb..42223ddf58 100644
--- a/crates/ide/src/inlay_hints/implicit_static.rs
+++ b/crates/ide/src/inlay_hints/implicit_static.rs
@@ -31,7 +31,6 @@ pub(super) fn hints(
         if ty.lifetime().is_none() {
             let t = ty.amp_token()?;
             acc.push(InlayHint {
-                needs_resolve: false,
                 range: t.text_range(),
                 kind: InlayKind::Lifetime,
                 label: "'static".into(),
diff --git a/crates/ide/src/inlay_hints/param_name.rs b/crates/ide/src/inlay_hints/param_name.rs
index 418fc002a8..96e845b2f3 100644
--- a/crates/ide/src/inlay_hints/param_name.rs
+++ b/crates/ide/src/inlay_hints/param_name.rs
@@ -57,7 +57,6 @@ pub(super) fn hints(
             let label =
                 InlayHintLabel::simple(format!("{param_name}{colon}"), None, linked_location);
             InlayHint {
-                needs_resolve: label.needs_resolve(),
                 range,
                 kind: InlayKind::Parameter,
                 label,
diff --git a/crates/ide/src/inlay_hints/range_exclusive.rs b/crates/ide/src/inlay_hints/range_exclusive.rs
index c4b0c199fc..bfb9283885 100644
--- a/crates/ide/src/inlay_hints/range_exclusive.rs
+++ b/crates/ide/src/inlay_hints/range_exclusive.rs
@@ -30,7 +30,6 @@ fn inlay_hint(token: SyntaxToken) -> InlayHint {
         kind: crate::InlayKind::RangeExclusive,
         label: crate::InlayHintLabel::from("<"),
         text_edit: None,
-        needs_resolve: false,
     }
 }
 
diff --git a/crates/ide/src/lib.rs b/crates/ide/src/lib.rs
index 6955e14a10..1c57f4f8f6 100644
--- a/crates/ide/src/lib.rs
+++ b/crates/ide/src/lib.rs
@@ -90,7 +90,7 @@ pub use crate::{
     inlay_hints::{
         AdjustmentHints, AdjustmentHintsMode, ClosureReturnTypeHints, DiscriminantHints,
         InlayFieldsToResolve, InlayHint, InlayHintLabel, InlayHintLabelPart, InlayHintPosition,
-        InlayHintsConfig, InlayKind, InlayTooltip, LifetimeElisionHints, RangeLimit,
+        InlayHintsConfig, InlayKind, InlayTooltip, LifetimeElisionHints,
     },
     join_lines::JoinLinesConfig,
     markup::Markup,
@@ -415,10 +415,19 @@ impl Analysis {
         &self,
         config: &InlayHintsConfig,
         file_id: FileId,
-        range: Option<RangeLimit>,
+        range: Option<TextRange>,
     ) -> Cancellable<Vec<InlayHint>> {
         self.with_db(|db| inlay_hints::inlay_hints(db, file_id, range, config))
     }
+    pub fn inlay_hints_resolve(
+        &self,
+        config: &InlayHintsConfig,
+        file_id: FileId,
+        position: TextSize,
+        hash: u64,
+    ) -> Cancellable<Option<InlayHint>> {
+        self.with_db(|db| inlay_hints::inlay_hints_resolve(db, file_id, position, hash, config))
+    }
 
     /// Returns the set of folding ranges.
     pub fn folding_ranges(&self, file_id: FileId) -> Cancellable<Vec<Fold>> {
diff --git a/crates/rust-analyzer/src/handlers/request.rs b/crates/rust-analyzer/src/handlers/request.rs
index 1d98457add..9d6eda3e5e 100644
--- a/crates/rust-analyzer/src/handlers/request.rs
+++ b/crates/rust-analyzer/src/handlers/request.rs
@@ -12,8 +12,8 @@ use anyhow::Context;
 
 use ide::{
     AnnotationConfig, AssistKind, AssistResolveStrategy, Cancellable, FilePosition, FileRange,
-    HoverAction, HoverGotoTypeData, InlayFieldsToResolve, Query, RangeInfo, RangeLimit,
-    ReferenceCategory, Runnable, RunnableKind, SingleResolve, SourceChange, TextEdit,
+    HoverAction, HoverGotoTypeData, InlayFieldsToResolve, Query, RangeInfo, ReferenceCategory,
+    Runnable, RunnableKind, SingleResolve, SourceChange, TextEdit,
 };
 use ide_db::SymbolKind;
 use itertools::Itertools;
@@ -1465,7 +1465,7 @@ pub(crate) fn handle_inlay_hints(
     let inlay_hints_config = snap.config.inlay_hints();
     Ok(Some(
         snap.analysis
-            .inlay_hints(&inlay_hints_config, file_id, Some(RangeLimit::Fixed(range)))?
+            .inlay_hints(&inlay_hints_config, file_id, Some(range))?
             .into_iter()
             .map(|it| {
                 to_proto::inlay_hint(
@@ -1499,10 +1499,11 @@ pub(crate) fn handle_inlay_hints_resolve(
     let hint_position = from_proto::offset(&line_index, original_hint.position)?;
     let mut forced_resolve_inlay_hints_config = snap.config.inlay_hints();
     forced_resolve_inlay_hints_config.fields_to_resolve = InlayFieldsToResolve::empty();
-    let resolve_hints = snap.analysis.inlay_hints(
+    let resolve_hints = snap.analysis.inlay_hints_resolve(
         &forced_resolve_inlay_hints_config,
         file_id,
-        Some(RangeLimit::NearestParent(hint_position)),
+        hint_position,
+        resolve_data.hash,
     )?;
 
     let mut resolved_hints = resolve_hints
diff --git a/crates/rust-analyzer/src/lsp/ext.rs b/crates/rust-analyzer/src/lsp/ext.rs
index 710ce7f8ac..5d3d75efcb 100644
--- a/crates/rust-analyzer/src/lsp/ext.rs
+++ b/crates/rust-analyzer/src/lsp/ext.rs
@@ -800,6 +800,7 @@ pub struct CompletionResolveData {
 #[derive(Debug, Serialize, Deserialize)]
 pub struct InlayHintResolveData {
     pub file_id: u32,
+    pub hash: u64,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
diff --git a/crates/rust-analyzer/src/lsp/to_proto.rs b/crates/rust-analyzer/src/lsp/to_proto.rs
index e77d0c13bf..dcff0ea747 100644
--- a/crates/rust-analyzer/src/lsp/to_proto.rs
+++ b/crates/rust-analyzer/src/lsp/to_proto.rs
@@ -13,7 +13,7 @@ use ide::{
     NavigationTarget, ReferenceCategory, RenameError, Runnable, Severity, SignatureHelp,
     SnippetEdit, SourceChange, StructureNodeKind, SymbolKind, TextEdit, TextRange, TextSize,
 };
-use ide_db::rust_doc::format_docs;
+use ide_db::{rust_doc::format_docs, FxHasher};
 use itertools::Itertools;
 use semver::VersionReq;
 use serde_json::to_value;
@@ -444,30 +444,42 @@ pub(crate) fn inlay_hint(
     fields_to_resolve: &InlayFieldsToResolve,
     line_index: &LineIndex,
     file_id: FileId,
-    inlay_hint: InlayHint,
+    mut inlay_hint: InlayHint,
 ) -> Cancellable<lsp_types::InlayHint> {
-    let needs_resolve = inlay_hint.needs_resolve;
-    let (label, tooltip, mut something_to_resolve) =
-        inlay_hint_label(snap, fields_to_resolve, needs_resolve, inlay_hint.label)?;
+    let resolve_hash = inlay_hint.needs_resolve().then(|| {
+        std::hash::BuildHasher::hash_one(
+            &std::hash::BuildHasherDefault::<FxHasher>::default(),
+            &inlay_hint,
+        )
+    });
 
+    let mut something_to_resolve = false;
     let text_edits = if snap
         .config
         .visual_studio_code_version()
         // https://github.com/microsoft/vscode/issues/193124
         .map_or(true, |version| VersionReq::parse(">=1.86.0").unwrap().matches(version))
-        && needs_resolve
+        && resolve_hash.is_some()
         && fields_to_resolve.resolve_text_edits
     {
         something_to_resolve |= inlay_hint.text_edit.is_some();
         None
     } else {
-        inlay_hint.text_edit.map(|it| text_edit_vec(line_index, it))
+        inlay_hint.text_edit.take().map(|it| text_edit_vec(line_index, it))
     };
-
-    let data = if needs_resolve && something_to_resolve {
-        Some(to_value(lsp_ext::InlayHintResolveData { file_id: file_id.index() }).unwrap())
-    } else {
-        None
+    let (label, tooltip) = inlay_hint_label(
+        snap,
+        fields_to_resolve,
+        &mut something_to_resolve,
+        resolve_hash.is_some(),
+        inlay_hint.label,
+    )?;
+
+    let data = match resolve_hash {
+        Some(hash) if something_to_resolve => Some(
+            to_value(lsp_ext::InlayHintResolveData { file_id: file_id.index(), hash }).unwrap(),
+        ),
+        _ => None,
     };
 
     Ok(lsp_types::InlayHint {
@@ -492,15 +504,15 @@ pub(crate) fn inlay_hint(
 fn inlay_hint_label(
     snap: &GlobalStateSnapshot,
     fields_to_resolve: &InlayFieldsToResolve,
+    something_to_resolve: &mut bool,
     needs_resolve: bool,
     mut label: InlayHintLabel,
-) -> Cancellable<(lsp_types::InlayHintLabel, Option<lsp_types::InlayHintTooltip>, bool)> {
-    let mut something_to_resolve = false;
+) -> Cancellable<(lsp_types::InlayHintLabel, Option<lsp_types::InlayHintTooltip>)> {
     let (label, tooltip) = match &*label.parts {
         [InlayHintLabelPart { linked_location: None, .. }] => {
             let InlayHintLabelPart { text, tooltip, .. } = label.parts.pop().unwrap();
             let hint_tooltip = if needs_resolve && fields_to_resolve.resolve_hint_tooltip {
-                something_to_resolve |= tooltip.is_some();
+                *something_to_resolve |= tooltip.is_some();
                 None
             } else {
                 match tooltip {
@@ -524,7 +536,7 @@ fn inlay_hint_label(
                 .into_iter()
                 .map(|part| {
                     let tooltip = if needs_resolve && fields_to_resolve.resolve_label_tooltip {
-                        something_to_resolve |= part.tooltip.is_some();
+                        *something_to_resolve |= part.tooltip.is_some();
                         None
                     } else {
                         match part.tooltip {
@@ -543,7 +555,7 @@ fn inlay_hint_label(
                         }
                     };
                     let location = if needs_resolve && fields_to_resolve.resolve_label_location {
-                        something_to_resolve |= part.linked_location.is_some();
+                        *something_to_resolve |= part.linked_location.is_some();
                         None
                     } else {
                         part.linked_location.map(|range| location(snap, range)).transpose()?
@@ -559,7 +571,7 @@ fn inlay_hint_label(
             (lsp_types::InlayHintLabel::LabelParts(parts), None)
         }
     };
-    Ok((label, tooltip, something_to_resolve))
+    Ok((label, tooltip))
 }
 
 static TOKEN_RESULT_COUNTER: AtomicU32 = AtomicU32::new(1);
diff --git a/docs/dev/lsp-extensions.md b/docs/dev/lsp-extensions.md
index cf9ad5fe04..8db66687aa 100644
--- a/docs/dev/lsp-extensions.md
+++ b/docs/dev/lsp-extensions.md
@@ -1,5 +1,5 @@
 <!---
-lsp/ext.rs hash: 61f485497d6e8e88
+lsp/ext.rs hash: d5febcbf63650753
 
 If you need to change the above hash to make the test pass, please check if you
 need to adjust this doc as well and ping this issue:
@@ -417,7 +417,7 @@ interface TestItem {
     // A human readable name for this test
     label: string;
     // The kind of this test item. Based on the kind,
-	// an icon is chosen by the editor. 
+	// an icon is chosen by the editor.
     kind: "package" | "module" | "test";
     // True if this test may have children not available eagerly
     canResolveChildren: boolean;
@@ -492,9 +492,9 @@ a `experimental/endRunTest` when is done.
 **Notification:** `ChangeTestStateParams`
 
 ```typescript
-type TestState = { tag: "passed" } 
+type TestState = { tag: "passed" }
     | {
-        tag: "failed"; 
+        tag: "failed";
         // The standard error of the test, containing the panic message. Clients should
         // render it similar to a terminal, and e.g. handle ansi colors.
         message: string;


Test patch:
diff --git a/crates/hir-ty/src/tests/traits.rs b/crates/hir-ty/src/tests/traits.rs
index ddb6ed8214..b80cfe18e4 100644
--- a/crates/hir-ty/src/tests/traits.rs
+++ b/crates/hir-ty/src/tests/traits.rs
@@ -1278,40 +1278,6 @@ fn bar() {
     );
 }
 
-#[test]
-fn argument_assoc_impl_trait() {
-    check_infer(
-        r#"
-trait Outer {
-    type Item;
-}
-
-trait Inner { }
-
-fn foo<T: Outer<Item = impl Inner>>(baz: T) {
-}
-
-impl Outer for usize {
-    type Item = usize;
-}
-
-impl Inner for usize {}
-
-fn main() {
-    foo(2);
-}
-"#,
-        expect![[r#"
-            85..88 'baz': T
-            93..96 '{ }': ()
-            182..197 '{     foo(2); }': ()
-            188..191 'foo': fn foo<usize>(usize)
-            188..194 'foo(2)': ()
-            192..193 '2': usize
-        "#]],
-    );
-}
-
 #[test]
 fn simple_return_pos_impl_trait() {
     cov_mark::check!(lower_rpit);