Save source & target types in hir's expr_adjustments

crates/hir/src/lib.rs

@@ -3691,6 +3691,13 @@ impl From<ItemInNs> for ScopeDef {
     }
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Adjustment {
+    pub source: Type,
+    pub target: Type,
+    pub kind: Adjust,
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum Adjust {
     /// Go from ! to any type.

crates/hir/src/semantics.rs

@@ -2,7 +2,7 @@
 
 mod source_to_def;
 
-use std::{cell::RefCell, fmt, iter, ops};
+use std::{cell::RefCell, fmt, iter, mem, ops};
 
 use base_db::{FileId, FileRange};
 use hir_def::{
@@ -29,7 +29,7 @@ use crate::{
     db::HirDatabase,
     semantics::source_to_def::{ChildContainer, SourceToDefCache, SourceToDefCtx},
     source_analyzer::{resolve_hir_path, SourceAnalyzer},
-    Access, Adjust, AutoBorrow, BindingMode, BuiltinAttr, Callable, ConstParam, Crate,
+    Access, Adjust, Adjustment, AutoBorrow, BindingMode, BuiltinAttr, Callable, ConstParam, Crate,
     DeriveHelper, Field, Function, HasSource, HirFileId, Impl, InFile, Label, LifetimeParam, Local,
     Macro, Module, ModuleDef, Name, OverloadedDeref, Path, ScopeDef, ToolModule, Trait, Type,
     TypeAlias, TypeParam, VariantDef,
@@ -334,7 +334,7 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
         self.imp.resolve_trait(trait_)
     }
 
-    pub fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjust>> {
+    pub fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjustment>> {
         self.imp.expr_adjustments(expr)
     }
 
@@ -1067,14 +1067,22 @@ impl<'db> SemanticsImpl<'db> {
         }
     }
 
-    fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjust>> {
+    fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjustment>> {
         let mutability = |m| match m {
             hir_ty::Mutability::Not => Mutability::Shared,
             hir_ty::Mutability::Mut => Mutability::Mut,
         };
-        self.analyze(expr.syntax())?.expr_adjustments(self.db, expr).map(|it| {
+
+        let analyzer = self.analyze(expr.syntax())?;
+
+        let (mut source_ty, _) = analyzer.type_of_expr(self.db, expr)?;
+
+        analyzer.expr_adjustments(self.db, expr).map(|it| {
             it.iter()
-                .map(|adjust| match adjust.kind {
+                .map(|adjust| {
+                    let target =
+                        Type::new_with_resolver(self.db, &analyzer.resolver, adjust.target.clone());
+                    let kind = match adjust.kind {
                         hir_ty::Adjust::NeverToAny => Adjust::NeverToAny,
                         hir_ty::Adjust::Deref(Some(hir_ty::OverloadedDeref(m))) => {
                             Adjust::Deref(Some(OverloadedDeref(mutability(m))))
@@ -1087,6 +1095,14 @@ impl<'db> SemanticsImpl<'db> {
                             Adjust::Borrow(AutoBorrow::Ref(mutability(m)))
                         }
                         hir_ty::Adjust::Pointer(pc) => Adjust::Pointer(pc),
+                    };
+
+                    // Update `source_ty` for the next adjustment
+                    let source = mem::replace(&mut source_ty, target.clone());
+
+                    let adjustment = Adjustment { source, target, kind };
+
+                    adjustment
                 })
                 .collect()
         })

crates/ide/src/inlay_hints/adjustment.rs

@@ -60,7 +60,7 @@ pub(super) fn hints(
     }
     for adjustment in adjustments.into_iter().rev() {
         // FIXME: Add some nicer tooltips to each of these
-        let text = match adjustment {
+        let text = match adjustment.kind {
             Adjust::NeverToAny if config.adjustment_hints == AdjustmentHints::Always => {
                 "<never-to-any>"
             }