Record updating format

src/fmt/expr.rs

@@ -537,6 +537,19 @@ pub fn fmt_record<'a>(
 ) {
     buf.push('{');
 
+    match _update {
+        None => {},
+        // We are presuming this to be a Var()
+        // If it wasnt a Var() we would not have made
+        // it this far. For example "{ 4 & hello = 9 }"
+        // doesnt make sense.
+        Some(record_var) => {
+            buf.push(' ');
+            fmt_expr(buf, &record_var.value, indent, false, false);
+            buf.push_str(" &");
+        },
+    }
+
     let is_multiline = loc_fields
         .iter()
         .any(|loc_field| is_multiline_field(&loc_field.value));

tests/test_format.rs

@@ -515,6 +515,59 @@ mod test_format {
         ));
     }
 
+    #[test]
+    fn record_updating() {
+        expr_formats_same(indoc!(
+            r#"
+            { shoes & leftShoe: nothing }
+            "#
+        ));
+
+        expr_formats_to(indoc!(
+            r#"
+            {   shoes  &  rightShoe : nothing }
+            "#
+        ),indoc!(
+            r#"
+            { shoes & rightShoe: nothing }
+            "#
+        ));
+
+        expr_formats_to(indoc!(
+            r#"
+            {   shoes  &  rightShoe : nothing }
+            "#
+        ),indoc!(
+            r#"
+            { shoes & rightShoe: nothing }
+            "#
+        ));
+
+        expr_formats_same(indoc!(
+            r#"
+            { shoes &
+                rightShoe: newRightShoe,
+                leftShoe: newLeftShoe
+            }
+            "#
+        ));
+
+        expr_formats_to(indoc!(
+            r#"
+            { shoes
+                & rightShoe: bareFoot
+                , leftShoe: bareFoot }
+            "#
+        ), indoc!(
+            r#"
+            { shoes &
+                rightShoe: bareFoot,
+                leftShoe: bareFoot
+            }
+            "#
+        ));
+    }
+
     // #[test]
     // fn record_field_destructuring() {
     //     expr_formats_same(indoc!(