Inline cond_needs_par into print_let

Author: dtolnay

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -1161,8 +1161,13 @@ impl<'a> State<'a> {
         self.word_space("=");
         self.print_expr_cond_paren(
             expr,
-            Self::cond_needs_par(expr)
-                || parser::needs_par_as_let_scrutinee(expr.precedence().order()),
+            match expr.kind {
+                ast::ExprKind::Break(..)
+                | ast::ExprKind::Closure(..)
+                | ast::ExprKind::Ret(..)
+                | ast::ExprKind::Yeet(..) => true,
+                _ => parser::contains_exterior_struct_lit(expr),
+            } || parser::needs_par_as_let_scrutinee(expr.precedence().order()),
         );
     }
 

compiler/rustc_ast_pretty/src/pprust/state/expr.rs

@@ -69,7 +69,7 @@ impl<'a> State<'a> {
     ///
     /// These cases need parens due to the parse error observed in #26461: `if return {}`
     /// parses as the erroneous construct `if (return {})`, not `if (return) {}`.
-    pub(super) fn cond_needs_par(expr: &ast::Expr) -> bool {
+    fn cond_needs_par(expr: &ast::Expr) -> bool {
         match expr.kind {
             ast::ExprKind::Break(..)
             | ast::ExprKind::Closure(..)