Observe unsafeness when generating manual impls of former derives

Author: alibektas

crates/ide-assists/src/handlers/add_missing_impl_members.rs

@@ -2363,4 +2363,33 @@ impl other_file_2::Trait for MyStruct {
 }"#,
         );
     }
+
+    #[test]
+    fn unsafeness_observed() {
+        check_assist(
+            add_missing_impl_members,
+            r#"
+unsafe trait UnsafeTrait {
+    unsafe fn unsafe_fn();
+}
+
+struct A {}
+
+impl Uns$0afeTrait for A {}
+            "#,
+            r#"
+unsafe trait UnsafeTrait {
+    unsafe fn unsafe_fn();
+}
+
+struct A {}
+
+unsafe impl UnsafeTrait for A {
+    unsafe fn unsafe_fn() {
+        ${0:todo!()}
+    }
+}
+            "#,
+        );
+    }
 }

crates/ide-assists/src/utils.rs

@@ -24,7 +24,7 @@ use syntax::{
         make,
         syntax_factory::SyntaxFactory,
     },
-    ted,
+    ted::{self, Position},
 };
 
 use crate::assist_context::{AssistContext, SourceChangeBuilder};
@@ -212,6 +212,10 @@ pub fn add_trait_assoc_items_to_impl(
     });
 
     let assoc_item_list = impl_.get_or_create_assoc_item_list();
+    if trait_.is_unsafe(sema.db) {
+        ted::insert(Position::first_child_of(impl_.syntax()), make::token(T![unsafe]));
+    }
+
     let mut first_item = None;
     for item in items {
         first_item.get_or_insert_with(|| item.clone());

crates/syntax/src/ast/make.rs

@@ -1276,7 +1276,7 @@ pub mod tokens {
 
     pub(super) static SOURCE_FILE: LazyLock<Parse<SourceFile>> = LazyLock::new(|| {
         SourceFile::parse(
-            "use crate::foo; const C: <()>::Item = ( true && true , true || true , 1 != 1, 2 == 2, 3 < 3, 4 <= 4, 5 > 5, 6 >= 6, !true, *p, &p , &mut p, async { let _ @ [] })\n;\n\nimpl A for B where: {}",
+            "use crate::foo; const C: <()>::Item = ( true && true , true || true , 1 != 1, 2 == 2, 3 < 3, 4 <= 4, 5 > 5, 6 >= 6, !true, *p, &p , &mut p, async { let _ @ [] })\n;\n\nunsafe impl A for B where: {}",
             Edition::CURRENT,
         )
     });