Wording tweak

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -98,8 +98,14 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 return;
             }
 
-            let err =
+            let err = self.report_use_of_uninitialized(
-                self.report_use_of_uninitialized(mpi, used_place, desired_action, span, use_spans);
+                mpi,
+                used_place,
+                moved_place,
+                desired_action,
+                span,
+                use_spans,
+            );
             self.buffer_error(err);
         } else {
             if let Some((reported_place, _)) = self.has_move_error(&move_out_indices) {
@@ -316,6 +322,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         &self,
         mpi: MovePathIndex,
         used_place: PlaceRef<'tcx>,
+        moved_place: PlaceRef<'tcx>,
         desired_action: InitializationRequiringAction,
         span: Span,
         use_spans: UseSpans<'tcx>,
@@ -334,11 +341,15 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             }
         }
 
-        let (binding, name, desc) =
+        let (name, desc) =
-            match self.describe_place_with_options(used_place, IncludingDowncast(true)) {
+            match self.describe_place_with_options(moved_place, IncludingDowncast(true)) {
-                Some(name) => (format!("`{name}`"), format!("`{name}`"), format!("`{name}` ")),
+                Some(name) => (format!("`{name}`"), format!("`{name}` ")),
-                None => ("value".to_string(), "the variable".to_string(), String::new()),
+                None => ("the variable".to_string(), String::new()),
             };
+        let path = match self.describe_place_with_options(used_place, IncludingDowncast(true)) {
+            Some(name) => format!("`{name}`"),
+            None => "value".to_string(),
+        };
 
         // We use the statements were the binding was initialized, and inspect the HIR to look
         // for the branching codepaths that aren't covered, to point at them.
@@ -390,13 +401,15 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             format!("{} occurs due to use{}", desired_action.as_noun(), use_spans.describe()),
         );
 
-        if let InitializationRequiringAction::PartialAssignment = desired_action {
+        if let InitializationRequiringAction::PartialAssignment
+        | InitializationRequiringAction::Assignment = desired_action
+        {
             err.help(
                 "partial initialization isn't supported, fully initialize the binding with a \
                  default value and mutate it, or use `std::mem::MaybeUninit`",
             );
         }
-        err.span_label(span, format!("{binding} {used} here but it {isnt_initialized}"));
+        err.span_label(span, format!("{path} {used} here but it {isnt_initialized}"));
 
         let mut shown = false;
         for (sp, label) in visitor.errors {

src/test/ui/borrowck/borrowck-init-in-fru.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `origin.y` isn't initialized
+error[E0381]: used binding `origin` isn't initialized
   --> $DIR/borrowck-init-in-fru.rs:9:14
    |
 LL |     let mut origin: Point;

src/test/ui/borrowck/borrowck-partial-reinit-4.stderr

@@ -5,6 +5,8 @@ LL |     let mut x : (Test2, Test2);
    |         ----- binding declared here but left uninitialized
 LL |     (x.0).0 = Some(Test);
    |     ^^^^^^^ `x.0` assigned here but it isn't fully initialized
+   |
+   = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrowck-uninit-field-access.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `a.x` isn't initialized
+error[E0381]: used binding `a` isn't initialized
   --> $DIR/borrowck-uninit-field-access.rs:21:13
    |
 LL |     let mut a: Point;

src/test/ui/borrowck/borrowck-uninit-ref-chain.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `**x` isn't initialized
+error[E0381]: used binding `x` isn't initialized
   --> $DIR/borrowck-uninit-ref-chain.rs:8:14
    |
 LL |     let x: &&Box<i32>;
@@ -6,7 +6,7 @@ LL |     let x: &&Box<i32>;
 LL |     let _y = &**x;
    |              ^^^^ `**x` used here but it isn't initialized
 
-error[E0381]: used binding `**x` isn't initialized
+error[E0381]: used binding `x` isn't initialized
   --> $DIR/borrowck-uninit-ref-chain.rs:11:14
    |
 LL |     let x: &&S<i32, i32>;
@@ -14,7 +14,7 @@ LL |     let x: &&S<i32, i32>;
 LL |     let _y = &**x;
    |              ^^^^ `**x` used here but it isn't initialized
 
-error[E0381]: used binding `**x` isn't initialized
+error[E0381]: used binding `x` isn't initialized
   --> $DIR/borrowck-uninit-ref-chain.rs:14:14
    |
 LL |     let x: &&i32;

src/test/ui/borrowck/borrowck-use-in-index-lvalue.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `*w` isn't initialized
+error[E0381]: used binding `w` isn't initialized
   --> $DIR/borrowck-use-in-index-lvalue.rs:3:5
    |
 LL |     let w: &mut [isize];
@@ -6,7 +6,7 @@ LL |     let w: &mut [isize];
 LL |     w[5] = 0;
    |     ^^^^ `*w` used here but it isn't initialized
 
-error[E0381]: used binding `*w` isn't initialized
+error[E0381]: used binding `w` isn't initialized
   --> $DIR/borrowck-use-in-index-lvalue.rs:6:5
    |
 LL |     let mut w: &mut [isize];

src/test/ui/borrowck/borrowck-use-uninitialized-in-cast-trait.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `*x` isn't initialized
+error[E0381]: used binding `x` isn't initialized
   --> $DIR/borrowck-use-uninitialized-in-cast-trait.rs:9:13
    |
 LL |     let x: &i32;

src/test/ui/borrowck/borrowck-use-uninitialized-in-cast.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `*x` isn't initialized
+error[E0381]: used binding `x` isn't initialized
   --> $DIR/borrowck-use-uninitialized-in-cast.rs:7:13
    |
 LL |     let x: &i32;

src/test/ui/const-generics/const-generic-default-wont-borrowck.stderr

@@ -1,4 +1,4 @@
-error[E0381]: used binding `*s` isn't initialized
+error[E0381]: used binding `s` isn't initialized
   --> $DIR/const-generic-default-wont-borrowck.rs:2:26
    |
 LL |     let s: &'static str; s.len()

src/test/ui/nll/issue-21232-partial-init-and-erroneous-use.stderr

@@ -5,6 +5,8 @@ LL |     let d: D;
    |         - binding declared here but left uninitialized
 LL |     d.x = 10;
    |     ^^^^^^^^ `d` assigned here but it isn't fully initialized
+   |
+   = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
 error[E0381]: assigned binding `d` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-erroneous-use.rs:33:5
@@ -13,6 +15,8 @@ LL |     let mut d: D;
    |         ----- binding declared here but left uninitialized
 LL |     d.x = 10;
    |     ^^^^^^^^ `d` assigned here but it isn't fully initialized
+   |
+   = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
 error[E0382]: assign of moved value: `d`
   --> $DIR/issue-21232-partial-init-and-erroneous-use.rs:39:5
@@ -24,7 +28,7 @@ LL |     drop(d);
 LL |     d.x = 10;
    |     ^^^^^^^^ value assigned here after move
 
-error[E0381]: partially assigned binding `d.s` isn't fully initialized
+error[E0381]: partially assigned binding `d` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-erroneous-use.rs:45:5
    |
 LL |     let d: D;
@@ -34,7 +38,7 @@ LL |     d.s.y = 20;
    |
    = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
-error[E0381]: partially assigned binding `d.s` isn't fully initialized
+error[E0381]: partially assigned binding `d` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-erroneous-use.rs:50:5
    |
 LL |     let mut d: D;

src/test/ui/nll/issue-21232-partial-init-and-use.stderr

@@ -98,7 +98,7 @@ LL |     t.0 = 10;
    |
    = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
-error[E0381]: partially assigned binding `q.r.f` isn't fully initialized
+error[E0381]: partially assigned binding `q` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:170:5
    |
 LL |     let q: Q<S<B>>;
@@ -108,7 +108,7 @@ LL |     q.r.f.x = 10; q.r.f.y = Box::new(20);
    |
    = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
-error[E0381]: partially assigned binding `q.r.f` isn't fully initialized
+error[E0381]: partially assigned binding `q` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:176:5
    |
 LL |     let q: Q<T>;
@@ -138,7 +138,7 @@ LL |     q.r.f.0 = 10; q.r.f.1 = Box::new(20);
    |
    = note: move occurs because `q.r` has type `R<(u32, Box<u32>)>`, which does not implement the `Copy` trait
 
-error[E0381]: partially assigned binding `q.r.f` isn't fully initialized
+error[E0381]: partially assigned binding `q` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:196:5
    |
 LL |     let q: Q<S<B>>;
@@ -148,7 +148,7 @@ LL |     q.r.f.x = 10;
    |
    = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
-error[E0381]: partially assigned binding `q.r.f` isn't fully initialized
+error[E0381]: partially assigned binding `q` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:202:5
    |
 LL |     let q: Q<T>;
@@ -178,7 +178,7 @@ LL |     q.r.f.0 = 10;
    |
    = note: move occurs because `q.r` has type `R<(u32, Box<u32>)>`, which does not implement the `Copy` trait
 
-error[E0381]: partially assigned binding `q.r.f` isn't fully initialized
+error[E0381]: partially assigned binding `q` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:222:5
    |
 LL |     let mut q: Q<S<Void>>;
@@ -188,7 +188,7 @@ LL |     q.r.f.x = 10;
    |
    = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
 
-error[E0381]: partially assigned binding `q.r.f` isn't fully initialized
+error[E0381]: partially assigned binding `q` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:228:5
    |
 LL |     let mut q: Q<Tvoid>;