Merge spans for the suggestion

Author: stanislav-tkach

src/librustc_typeck/check/callee.rs

@@ -35,13 +35,18 @@ pub fn check_legal_trait_for_method_call(
             .and_then(|s| tcx.sess.source_map().span_to_snippet(s).ok())
             .unwrap_or_default();
 
-        let (suggestion, applicability) = if snippet.is_empty() {
-            (snippet, Applicability::Unspecified)
-        } else {
-            (format!("drop({})", snippet), Applicability::MachineApplicable)
-        };
+        let suggestion =
+            if snippet.is_empty() { "drop".to_string() } else { format!("drop({})", snippet) };
+
+        let suggestion_span =
+            receiver.and_then(|s| tcx.sess.source_map().merge_spans(s, span)).unwrap_or(span);
 
-        err.span_suggestion(span, "consider using `drop` function", suggestion, applicability);
+        err.span_suggestion(
+            suggestion_span,
+            "consider using `drop` function",
+            suggestion,
+            Applicability::MaybeIncorrect,
+        );
 
         err.emit();
     }

src/test/ui/error-codes/E0040.stderr

@@ -2,10 +2,10 @@ error[E0040]: explicit use of destructor method
   --> $DIR/E0040.rs:13:7
    |
 LL |     x.drop();
-   |       ^^^^
-   |       |
-   |       explicit destructor calls not allowed
-   |       help: consider using `drop` function: `drop(x)`
+   |     --^^^^
+   |     | |
+   |     | explicit destructor calls not allowed
+   |     help: consider using `drop` function: `drop(x)`
 
 error: aborting due to previous error
 

src/test/ui/explicit/explicit-call-to-dtor.stderr

@@ -2,10 +2,10 @@ error[E0040]: explicit use of destructor method
   --> $DIR/explicit-call-to-dtor.rs:13:7
    |
 LL |     x.drop();
-   |       ^^^^
-   |       |
-   |       explicit destructor calls not allowed
-   |       help: consider using `drop` function: `drop(x)`
+   |     --^^^^
+   |     | |
+   |     | explicit destructor calls not allowed
+   |     help: consider using `drop` function: `drop(x)`
 
 error: aborting due to previous error
 

src/test/ui/explicit/explicit-call-to-supertrait-dtor.stderr

@@ -2,10 +2,10 @@ error[E0040]: explicit use of destructor method
   --> $DIR/explicit-call-to-supertrait-dtor.rs:17:14
    |
 LL |         self.drop();
-   |              ^^^^
-   |              |
-   |              explicit destructor calls not allowed
-   |              help: consider using `drop` function: `drop(self)`
+   |         -----^^^^
+   |         |    |
+   |         |    explicit destructor calls not allowed
+   |         help: consider using `drop` function: `drop(self)`
 
 error: aborting due to previous error
 

src/test/ui/illegal-ufcs-drop.stderr

@@ -5,7 +5,7 @@ LL |     Drop::drop(&mut Foo)
    |     ^^^^^^^^^^
    |     |
    |     explicit destructor calls not allowed
-   |     help: consider using `drop` function
+   |     help: consider using `drop` function: `drop`
 
 error: aborting due to previous error