Use more accurate span for addr_of! suggestion

Use a multipart suggestion instead of a single whole-span replacement:

```
error[E0796]: creating a shared reference to a mutable static
  --> $DIR/reference-to-mut-static-unsafe-fn.rs:10:18
   |
LL |         let _y = &X;
   |                  ^^ shared reference to mutable static
   |
   = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
help: use `addr_of!` instead to create a raw pointer
   |
LL |         let _y = addr_of!(X);
   |                  ~~~~~~~~~ +
```

Author: estebank

compiler/rustc_hir_analysis/src/check/errs.rs

@@ -1,5 +1,4 @@
 use rustc_hir as hir;
-use rustc_hir_pretty::qpath_to_string;
 use rustc_lint_defs::builtin::STATIC_MUT_REFS;
 use rustc_middle::ty::{Mutability, TyCtxt};
 use rustc_span::Span;
@@ -12,9 +11,17 @@ pub fn maybe_expr_static_mut(tcx: TyCtxt<'_>, expr: hir::Expr<'_>) {
     let hir_id = expr.hir_id;
     if let hir::ExprKind::AddrOf(borrow_kind, m, expr) = expr.kind
         && matches!(borrow_kind, hir::BorrowKind::Ref)
-        && let Some(var) = path_if_static_mut(tcx, expr)
+        && path_if_static_mut(expr)
     {
-        handle_static_mut_ref(tcx, span, var, span.edition().at_least_rust_2024(), m, hir_id);
+        handle_static_mut_ref(
+            tcx,
+            span,
+            span.with_hi(expr.span.lo()),
+            span.shrink_to_hi(),
+            span.edition().at_least_rust_2024(),
+            m,
+            hir_id,
+        );
     }
 }
 
@@ -24,51 +31,53 @@ pub fn maybe_stmt_static_mut(tcx: TyCtxt<'_>, stmt: hir::Stmt<'_>) {
         && let hir::PatKind::Binding(ba, _, _, _) = loc.pat.kind
         && let hir::ByRef::Yes(rmutbl) = ba.0
         && let Some(init) = loc.init
-        && let Some(var) = path_if_static_mut(tcx, init)
+        && path_if_static_mut(init)
     {
         handle_static_mut_ref(
             tcx,
             init.span,
-            var,
+            init.span.shrink_to_lo(),
+            init.span.shrink_to_hi(),
             loc.span.edition().at_least_rust_2024(),
             rmutbl,
             stmt.hir_id,
         );
     }
 }
 
-fn path_if_static_mut(tcx: TyCtxt<'_>, expr: &hir::Expr<'_>) -> Option<String> {
+fn path_if_static_mut(expr: &hir::Expr<'_>) -> bool {
     if let hir::ExprKind::Path(qpath) = expr.kind
         && let hir::QPath::Resolved(_, path) = qpath
         && let hir::def::Res::Def(def_kind, _) = path.res
         && let hir::def::DefKind::Static { safety: _, mutability: Mutability::Mut, nested: false } =
             def_kind
     {
-        return Some(qpath_to_string(&tcx, &qpath));
+        return true;
     }
-    None
+    false
 }
 
 fn handle_static_mut_ref(
     tcx: TyCtxt<'_>,
     span: Span,
-    var: String,
+    lo: Span,
+    hi: Span,
     e2024: bool,
     mutable: Mutability,
     hir_id: hir::HirId,
 ) {
     if e2024 {
         let (sugg, shared) = if mutable == Mutability::Mut {
-            (errors::StaticMutRefSugg::Mut { span, var }, "mutable")
+            (errors::MutRefSugg::Mut { lo, hi }, "mutable")
         } else {
-            (errors::StaticMutRefSugg::Shared { span, var }, "shared")
+            (errors::MutRefSugg::Shared { lo, hi }, "shared")
         };
         tcx.dcx().emit_err(errors::StaticMutRef { span, sugg, shared });
     } else {
         let (sugg, shared) = if mutable == Mutability::Mut {
-            (errors::RefOfMutStaticSugg::Mut { span, var }, "mutable")
+            (errors::MutRefSugg::Mut { lo, hi }, "mutable")
         } else {
-            (errors::RefOfMutStaticSugg::Shared { span, var }, "shared")
+            (errors::MutRefSugg::Shared { lo, hi }, "shared")
         };
         tcx.emit_node_span_lint(
             STATIC_MUT_REFS,

compiler/rustc_hir_analysis/src/errors.rs

@@ -1500,33 +1500,33 @@ pub struct StaticMutRef<'a> {
     #[label]
     pub span: Span,
     #[subdiagnostic]
-    pub sugg: StaticMutRefSugg,
+    pub sugg: MutRefSugg,
     pub shared: &'a str,
 }
 
 #[derive(Subdiagnostic)]
-pub enum StaticMutRefSugg {
-    #[suggestion(
+pub enum MutRefSugg {
+    #[multipart_suggestion(
         hir_analysis_suggestion,
         style = "verbose",
-        code = "addr_of!({var})",
         applicability = "maybe-incorrect"
     )]
     Shared {
-        #[primary_span]
-        span: Span,
-        var: String,
+        #[suggestion_part(code = "addr_of!(")]
+        lo: Span,
+        #[suggestion_part(code = ")")]
+        hi: Span,
     },
-    #[suggestion(
+    #[multipart_suggestion(
         hir_analysis_suggestion_mut,
         style = "verbose",
-        code = "addr_of_mut!({var})",
         applicability = "maybe-incorrect"
     )]
     Mut {
-        #[primary_span]
-        span: Span,
-        var: String,
+        #[suggestion_part(code = "addr_of_mut!(")]
+        lo: Span,
+        #[suggestion_part(code = ")")]
+        hi: Span,
     },
 }
 
@@ -1539,36 +1539,10 @@ pub struct RefOfMutStatic<'a> {
     #[label]
     pub span: Span,
     #[subdiagnostic]
-    pub sugg: RefOfMutStaticSugg,
+    pub sugg: MutRefSugg,
     pub shared: &'a str,
 }
 
-#[derive(Subdiagnostic)]
-pub enum RefOfMutStaticSugg {
-    #[suggestion(
-        hir_analysis_suggestion,
-        style = "verbose",
-        code = "addr_of!({var})",
-        applicability = "maybe-incorrect"
-    )]
-    Shared {
-        #[primary_span]
-        span: Span,
-        var: String,
-    },
-    #[suggestion(
-        hir_analysis_suggestion_mut,
-        style = "verbose",
-        code = "addr_of_mut!({var})",
-        applicability = "maybe-incorrect"
-    )]
-    Mut {
-        #[primary_span]
-        span: Span,
-        var: String,
-    },
-}
-
 #[derive(Diagnostic)]
 #[diag(hir_analysis_not_supported_delegation)]
 pub struct NotSupportedDelegation<'a> {

tests/ui/abi/statics/static-mut-foreign.stderr

@@ -11,7 +11,7 @@ LL |     static_bound(&rust_dbg_static_mut);
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |     static_bound(addr_of!(rust_dbg_static_mut));
-   |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+   |                  ~~~~~~~~~                   +
 
 warning: creating a mutable reference to mutable static is discouraged
   --> $DIR/static-mut-foreign.rs:33:22
@@ -25,7 +25,7 @@ LL |     static_bound_set(&mut rust_dbg_static_mut);
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |     static_bound_set(addr_of_mut!(rust_dbg_static_mut));
-   |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+   |                      ~~~~~~~~~~~~~                   +
 
 warning: 2 warnings emitted
 

tests/ui/borrowck/borrowck-access-permissions.stderr

@@ -11,7 +11,7 @@ LL |             let _y2 = &mut static_x_mut;
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |             let _y2 = addr_of_mut!(static_x_mut);
-   |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~
+   |                       ~~~~~~~~~~~~~            +
 
 error[E0596]: cannot borrow `x` as mutable, as it is not declared as mutable
   --> $DIR/borrowck-access-permissions.rs:10:19

tests/ui/borrowck/borrowck-unsafe-static-mutable-borrows.stderr

@@ -11,7 +11,7 @@ LL |         let sfoo: *mut Foo = &mut SFOO;
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |         let sfoo: *mut Foo = addr_of_mut!(SFOO);
-   |                              ~~~~~~~~~~~~~~~~~~
+   |                              ~~~~~~~~~~~~~    +
 
 warning: 1 warning emitted
 

tests/ui/borrowck/issue-20801.stderr

@@ -11,7 +11,7 @@ LL |     unsafe { &mut GLOBAL_MUT_T }
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |     unsafe { addr_of_mut!(GLOBAL_MUT_T) }
-   |              ~~~~~~~~~~~~~~~~~~~~~~~~~~
+   |              ~~~~~~~~~~~~~            +
 
 error[E0507]: cannot move out of a mutable reference
   --> $DIR/issue-20801.rs:27:22

tests/ui/borrowck/issue-55492-borrowck-migrate-scans-parents.stderr

@@ -11,7 +11,7 @@ LL |             c1(&mut Y);
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |             c1(addr_of_mut!(Y));
-   |                ~~~~~~~~~~~~~~~
+   |                ~~~~~~~~~~~~~ +
 
 warning: creating a mutable reference to mutable static is discouraged
   --> $DIR/issue-55492-borrowck-migrate-scans-parents.rs:27:16
@@ -25,7 +25,7 @@ LL |             c1(&mut Z);
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |             c1(addr_of_mut!(Z));
-   |                ~~~~~~~~~~~~~~~
+   |                ~~~~~~~~~~~~~ +
 
 warning: creating a mutable reference to mutable static is discouraged
   --> $DIR/issue-55492-borrowck-migrate-scans-parents.rs:64:37
@@ -39,7 +39,7 @@ LL |         borrowck_closures_unique::e(&mut X);
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |         borrowck_closures_unique::e(addr_of_mut!(X));
-   |                                     ~~~~~~~~~~~~~~~
+   |                                     ~~~~~~~~~~~~~ +
 
 error[E0594]: cannot assign to `x`, as it is not declared as mutable
   --> $DIR/issue-55492-borrowck-migrate-scans-parents.rs:9:46

tests/ui/consts/const_let_assign2.stderr

@@ -11,7 +11,7 @@ LL |     let ptr = unsafe { &mut BB };
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |     let ptr = unsafe { addr_of_mut!(BB) };
-   |                        ~~~~~~~~~~~~~~~~
+   |                        ~~~~~~~~~~~~~  +
 
 warning: 1 warning emitted
 

tests/ui/drop/issue-23338-ensure-param-drop-order.stderr

@@ -11,7 +11,7 @@ LL |             (mem::size_of_val(&trails) * 8) as u32
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |             (mem::size_of_val(addr_of!(trails)) * 8) as u32
-   |                               ~~~~~~~~~~~~~~~~
+   |                               ~~~~~~~~~      +
 
 warning: 1 warning emitted
 

tests/ui/drop/issue-23611-enum-swap-in-drop.stderr

@@ -11,7 +11,7 @@ LL |             (mem::size_of_val(&trails) * 8) as u32
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |             (mem::size_of_val(addr_of!(trails)) * 8) as u32
-   |                               ~~~~~~~~~~~~~~~~
+   |                               ~~~~~~~~~      +
 
 warning: 1 warning emitted
 

tests/ui/issues/issue-54410.stderr

@@ -19,7 +19,7 @@ LL |     println!("{:p}", unsafe { &symbol });
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |     println!("{:p}", unsafe { addr_of!(symbol) });
-   |                               ~~~~~~~~~~~~~~~~
+   |                               ~~~~~~~~~      +
 
 error: aborting due to 1 previous error; 1 warning emitted
 

tests/ui/nll/borrowck-thread-local-static-mut-borrow-outlives-fn.stderr

@@ -11,7 +11,7 @@ LL |         S1 { a: unsafe { &mut X1 } }
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |         S1 { a: unsafe { addr_of_mut!(X1) } }
-   |                          ~~~~~~~~~~~~~~~~
+   |                          ~~~~~~~~~~~~~  +
 
 warning: 1 warning emitted
 

tests/ui/static/reference-to-mut-static-safe.e2021.stderr

@@ -11,7 +11,7 @@ LL |     let _x = &X;
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |     let _x = addr_of!(X);
-   |              ~~~~~~~~~~~
+   |              ~~~~~~~~~ +
 
 error[E0133]: use of mutable static is unsafe and requires unsafe function or block
   --> $DIR/reference-to-mut-static-safe.rs:9:15

tests/ui/static/reference-to-mut-static-safe.e2024.stderr

@@ -8,7 +8,7 @@ LL |     let _x = &X;
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |     let _x = addr_of!(X);
-   |              ~~~~~~~~~~~
+   |              ~~~~~~~~~ +
 
 error[E0133]: use of mutable static is unsafe and requires unsafe block
   --> $DIR/reference-to-mut-static-safe.rs:9:15

tests/ui/static/reference-to-mut-static-unsafe-fn.stderr

@@ -8,7 +8,7 @@ LL |         let _y = &X;
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |         let _y = addr_of!(X);
-   |                  ~~~~~~~~~~~
+   |                  ~~~~~~~~~ +
 
 error[E0796]: creating a shared reference to a mutable static
   --> $DIR/reference-to-mut-static-unsafe-fn.rs:13:22
@@ -20,7 +20,7 @@ LL |         let ref _a = X;
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |         let ref _a = addr_of!(X);
-   |                      ~~~~~~~~~~~
+   |                      +++++++++ +
 
 error[E0796]: creating a mutable reference to a mutable static
   --> $DIR/reference-to-mut-static-unsafe-fn.rs:16:26
@@ -32,7 +32,7 @@ LL |         let ref mut _a = X;
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |         let ref mut _a = addr_of_mut!(X);
-   |                          ~~~~~~~~~~~~~~~
+   |                          +++++++++++++ +
 
 error[E0796]: creating a shared reference to a mutable static
   --> $DIR/reference-to-mut-static-unsafe-fn.rs:19:25
@@ -44,7 +44,7 @@ LL |         let (_b, _c) = (&X, &mut Y);
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |         let (_b, _c) = (addr_of!(X), &mut Y);
-   |                         ~~~~~~~~~~~
+   |                         ~~~~~~~~~ +
 
 error[E0796]: creating a mutable reference to a mutable static
   --> $DIR/reference-to-mut-static-unsafe-fn.rs:19:29
@@ -56,7 +56,7 @@ LL |         let (_b, _c) = (&X, &mut Y);
 help: use `addr_of_mut!` instead to create a raw pointer
    |
 LL |         let (_b, _c) = (&X, addr_of_mut!(Y));
-   |                             ~~~~~~~~~~~~~~~
+   |                             ~~~~~~~~~~~~~ +
 
 error[E0796]: creating a shared reference to a mutable static
   --> $DIR/reference-to-mut-static-unsafe-fn.rs:23:13
@@ -68,7 +68,7 @@ LL |         foo(&X);
 help: use `addr_of!` instead to create a raw pointer
    |
 LL |         foo(addr_of!(X));
-   |             ~~~~~~~~~~~
+   |             ~~~~~~~~~ +
 
 error: aborting due to 6 previous errors