remove nested in expr

compiler/parse/src/ast.rs

@@ -151,10 +151,6 @@ pub enum Expr<'a> {
     SpaceAfter(&'a Expr<'a>, &'a [CommentOrNewline<'a>]),
     ParensAround(&'a Expr<'a>),
 
-    /// This is used only to avoid cloning when reordering expressions (e.g. in desugar()).
-    /// It lets us take an (&Expr) and create a plain (Expr) from it.
-    Nested(&'a Expr<'a>),
-
     // Problems
     MalformedIdent(&'a str, crate::ident::BadIdent),
     MalformedClosure,

compiler/parse/src/expr.rs

@@ -1335,9 +1335,7 @@ fn expr_to_pattern_help<'a>(arena: &'a Bump, expr: &Expr<'a>) -> Result<Pattern<
             spaces,
         )),
 
-        Expr::ParensAround(sub_expr) | Expr::Nested(sub_expr) => {
-            expr_to_pattern_help(arena, sub_expr)
-        }
+        Expr::ParensAround(sub_expr) => expr_to_pattern_help(arena, sub_expr),
 
         Expr::Record {
             fields,