implement formatting for super let

src/items.rs

@@ -65,19 +65,17 @@ impl Rewrite for ast::Local {
             return Err(RewriteError::SkipFormatting);
         }
 
-        // FIXME(super_let): Implement formatting
-        if self.super_.is_some() {
-            return Err(RewriteError::SkipFormatting);
-        }
-
+        let super_ = self.super_.is_some();
+        // FIXME: deletes any comments in between super and let
+        let let_ = if super_ { "super let " } else { "let " };
         let attrs_str = self.attrs.rewrite_result(context, shape)?;
         let mut result = if attrs_str.is_empty() {
-            "let ".to_owned()
+            let_.to_owned()
         } else {
             combine_strs_with_missing_comments(
                 context,
                 &attrs_str,
-                "let ",
+                let_,
                 mk_sp(
                     self.attrs.last().map(|a| a.span.hi()).unwrap(),
                     self.span.lo(),
@@ -86,10 +84,9 @@ impl Rewrite for ast::Local {
                 false,
             )?
         };
-        let let_kw_offset = result.len() - "let ".len();
+        let let_kw_offset = result.len() - let_.len();
 
-        // 4 = "let ".len()
-        let pat_shape = shape.offset_left(4, self.span())?;
+        let pat_shape = shape.offset_left(let_.len(), self.span())?;
         // 1 = ;
         let pat_shape = pat_shape.sub_width(1, self.span())?;
         let pat_str = self.pat.rewrite_result(context, pat_shape)?;

tests/source/super_let.rs

@@ -0,0 +1,7 @@
+#![feature(super_let)]
+fn main() {
+    super let x =(
+            &1,
+
+            ) else { 3};
+}

tests/target/super_let.rs

@@ -0,0 +1,4 @@
+#![feature(super_let)]
+fn main() {
+    super let x = (&1,) else { 3 };
+}