From 1798e2c65b3c2c0c1ef674b000dce2636c834783 Mon Sep 17 00:00:00 2001
From: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Date: Mon, 2 Sep 2024 14:31:32 +0200
Subject: [PATCH] go/printer: do not panic on *ast.ParenExpr

---
 src/go/printer/nodes.go                 | 4 +---
 src/go/printer/testdata/generics.golden | 2 ++
 src/go/printer/testdata/generics.input  | 2 ++
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/go/printer/nodes.go b/src/go/printer/nodes.go
index a4651e0608..495ec22031 100644
--- a/src/go/printer/nodes.go
+++ b/src/go/printer/nodes.go
@@ -411,9 +411,7 @@ func combinesWithName(x ast.Expr) bool {
 	case *ast.BinaryExpr:
 		return combinesWithName(x.X) && !isTypeElem(x.Y)
 	case *ast.ParenExpr:
-		// name(x) combines but we are making sure at
-		// the call site that x is never parenthesized.
-		panic("unexpected parenthesized expression")
+		return combinesWithName(x.X)
 	}
 	return false
 }
diff --git a/src/go/printer/testdata/generics.golden b/src/go/printer/testdata/generics.golden
index 7ddf20b3d1..89f5b88dbf 100644
--- a/src/go/printer/testdata/generics.golden
+++ b/src/go/printer/testdata/generics.golden
@@ -45,6 +45,8 @@ type _[P T | T] struct{}
 type _[P T | T | T | T] struct{}
 type _[P *T, _ any] struct{}
 type _[P *T,] struct{}
+type _[P *T,] struct{}
+type _[P ~int] struct{}
 type _[P *T, _ any] struct{}
 type _[P T] struct{}
 type _[P T, _ any] struct{}
diff --git a/src/go/printer/testdata/generics.input b/src/go/printer/testdata/generics.input
index 4940f9319a..bc24119c2e 100644
--- a/src/go/printer/testdata/generics.input
+++ b/src/go/printer/testdata/generics.input
@@ -42,6 +42,8 @@ type _[P T | T] struct{}
 type _[P T | T | T | T] struct{}
 type _[P *T, _ any] struct{}
 type _[P (*T),] struct{}
+type _[P ((*T)),] struct{}
+type _[P ((~int)),] struct{}
 type _[P (*T), _ any] struct{}
 type _[P (T),] struct{}
 type _[P (T), _ any] struct{}