Merge pull request rust-lang#19764 from ChayimFriedman2/too-many-asterisks-dbg

fix: Fix postfix snippets duplicating derefs

Author: ChayimFriedman2

src/tools/rust-analyzer/crates/ide-completion/src/completions/postfix.rs

@@ -311,34 +311,35 @@ fn include_references(initial_element: &ast::Expr) -> (ast::Expr, String) {
 
     let mut prefix = String::new();
 
+    let mut found_ref_or_deref = false;
+
     while let Some(parent_deref_element) =
         resulting_element.syntax().parent().and_then(ast::PrefixExpr::cast)
     {
         if parent_deref_element.op_kind() != Some(ast::UnaryOp::Deref) {
             break;
         }
 
+        found_ref_or_deref = true;
         resulting_element = ast::Expr::from(parent_deref_element);
 
         prefix.insert(0, '*');
     }
 
-    if let Some(first_ref_expr) = resulting_element.syntax().parent().and_then(ast::RefExpr::cast) {
-        if let Some(expr) = first_ref_expr.expr() {
-            resulting_element = expr;
-        }
+    while let Some(parent_ref_element) =
+        resulting_element.syntax().parent().and_then(ast::RefExpr::cast)
+    {
+        found_ref_or_deref = true;
+        let exclusive = parent_ref_element.mut_token().is_some();
+        resulting_element = ast::Expr::from(parent_ref_element);
 
-        while let Some(parent_ref_element) =
-            resulting_element.syntax().parent().and_then(ast::RefExpr::cast)
-        {
-            let exclusive = parent_ref_element.mut_token().is_some();
-            resulting_element = ast::Expr::from(parent_ref_element);
+        prefix.insert_str(0, if exclusive { "&mut " } else { "&" });
+    }
 
-            prefix.insert_str(0, if exclusive { "&mut " } else { "&" });
-        }
-    } else {
-        // If we do not find any ref expressions, restore
+    if !found_ref_or_deref {
+        // If we do not find any ref/deref expressions, restore
         // all the progress of tree climbing
+        prefix.clear();
         resulting_element = initial_element.clone();
     }
 

src/tools/rust-analyzer/crates/ide-completion/src/tests/expression.rs

@@ -2174,3 +2174,22 @@ fn bar() {
     "#,
     );
 }
+
+#[test]
+fn dbg_too_many_asterisks() {
+    check_edit(
+        "dbg",
+        r#"
+fn main() {
+    let x = &42;
+    let y = *x.$0;
+}
+    "#,
+        r#"
+fn main() {
+    let x = &42;
+    let y = dbg!(*x);
+}
+    "#,
+    );
+}