minor: Migrate remove_unnecessary_wrapper to SyntaxEditor

Author: Giga-Bowser

src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/type_mismatch.rs

@@ -9,9 +9,10 @@ use syntax::{
     ast::{
         self,
         edit::{AstNodeEdit, IndentLevel},
-        make, BlockExpr, Expr, ExprStmt, HasArgList,
+        syntax_factory::SyntaxFactory,
+        BlockExpr, Expr, ExprStmt, HasArgList,
     },
-    ted, AstNode, AstPtr, TextSize,
+    AstNode, AstPtr, TextSize,
 };
 
 use crate::{adjusted_display_range, fix, Assist, Diagnostic, DiagnosticCode, DiagnosticsContext};
@@ -223,8 +224,9 @@ fn remove_unnecessary_wrapper(
 
     let inner_arg = call_expr.arg_list()?.args().next()?;
 
-    let mut builder = SourceChangeBuilder::new(expr_ptr.file_id.original_file(ctx.sema.db));
-
+    let file_id = expr_ptr.file_id.original_file(db);
+    let mut builder = SourceChangeBuilder::new(file_id);
+    let mut editor;
     match inner_arg {
         // We're returning `()`
         Expr::TupleExpr(tup) if tup.fields().next().is_none() => {
@@ -233,35 +235,33 @@ fn remove_unnecessary_wrapper(
                 .parent()
                 .and_then(Either::<ast::ReturnExpr, ast::StmtList>::cast)?;
 
+            editor = builder.make_editor(parent.syntax());
+            let make = SyntaxFactory::new();
+
             match parent {
                 Either::Left(ret_expr) => {
-                    let old = builder.make_mut(ret_expr);
-                    let new = make::expr_return(None).clone_for_update();
-
-                    ted::replace(old.syntax(), new.syntax());
+                    editor.replace(ret_expr.syntax(), make.expr_return(None).syntax());
                 }
                 Either::Right(stmt_list) => {
-                    if stmt_list.statements().count() == 0 {
-                        let block = stmt_list.syntax().parent().and_then(ast::BlockExpr::cast)?;
-                        let old = builder.make_mut(block);
-                        let new = make::expr_empty_block().clone_for_update();
-
-                        ted::replace(old.syntax(), new.syntax());
+                    let new_block = if stmt_list.statements().next().is_none() {
+                        make.expr_empty_block()
                     } else {
-                        let old = builder.make_syntax_mut(stmt_list.syntax().parent()?);
-                        let new = make::block_expr(stmt_list.statements(), None).clone_for_update();
+                        make.block_expr(stmt_list.statements(), None)
+                    };
 
-                        ted::replace(old, new.syntax());
-                    }
+                    editor.replace(stmt_list.syntax().parent()?, new_block.syntax());
                 }
             }
+
+            editor.add_mappings(make.finish_with_mappings());
         }
         _ => {
-            let call_mut = builder.make_mut(call_expr.clone());
-            ted::replace(call_mut.syntax(), inner_arg.clone_for_update().syntax());
+            editor = builder.make_editor(call_expr.syntax());
+            editor.replace(call_expr.syntax(), inner_arg.syntax());
         }
     }
 
+    builder.add_file_edits(file_id, editor);
     let name = format!("Remove unnecessary {}() wrapper", variant.name(db).as_str());
     acc.push(fix(
         "remove_unnecessary_wrapper",
@@ -848,6 +848,29 @@ fn div(x: i32, y: i32) -> i32 {
         );
     }
 
+    #[test]
+    fn unwrap_return_type_option_tail_unit() {
+        check_fix(
+            r#"
+//- minicore: option, result
+fn div(x: i32, y: i32) {
+    if y == 0 {
+        panic!();
+    }
+
+    Ok(())$0
+}
+"#,
+            r#"
+fn div(x: i32, y: i32) {
+    if y == 0 {
+        panic!();
+    }
+}
+"#,
+        );
+    }
+
     #[test]
     fn unwrap_return_type_handles_generic_functions() {
         check_fix(

src/tools/rust-analyzer/crates/syntax/src/ast/syntax_factory/constructors.rs

@@ -89,6 +89,10 @@ impl SyntaxFactory {
         ast
     }
 
+    pub fn expr_empty_block(&self) -> ast::BlockExpr {
+        ast::BlockExpr { syntax: make::expr_empty_block().syntax().clone_for_update() }
+    }
+
     pub fn expr_bin(&self, lhs: ast::Expr, op: ast::BinaryOp, rhs: ast::Expr) -> ast::BinExpr {
         let ast::Expr::BinExpr(ast) =
             make::expr_bin_op(lhs.clone(), op, rhs.clone()).clone_for_update()
@@ -135,6 +139,22 @@ impl SyntaxFactory {
         ast.into()
     }
 
+    pub fn expr_return(&self, expr: Option<ast::Expr>) -> ast::ReturnExpr {
+        let ast::Expr::ReturnExpr(ast) = make::expr_return(expr.clone()).clone_for_update() else {
+            unreachable!()
+        };
+
+        if let Some(mut mapping) = self.mappings() {
+            let mut builder = SyntaxMappingBuilder::new(ast.syntax().clone());
+            if let Some(input) = expr {
+                builder.map_node(input.syntax().clone(), ast.expr().unwrap().syntax().clone());
+            }
+            builder.finish(&mut mapping);
+        }
+
+        ast
+    }
+
     pub fn let_stmt(
         &self,
         pattern: ast::Pat,