From 063aff900ca150b80930c8de76f11d7e6488222f Mon Sep 17 00:00:00 2001
From: Ludovic Fernandez <ldez@users.noreply.github.com>
Date: Sat, 27 Apr 2024 21:52:14 +0200
Subject: [PATCH] fix: parenthesized expression as receiver (#78)

Fixes #77.
---
 check/check.go                                |  2 ++
 .../script/parenthesized_expression.txtar     | 20 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 testdata/script/parenthesized_expression.txtar

diff --git a/check/check.go b/check/check.go
index 39de800..b1704e4 100644
--- a/check/check.go
+++ b/check/check.go
@@ -913,6 +913,8 @@ func recvPrefix(recv *ast.FieldList) string {
 		return expr.Name + "."
 	case *ast.IndexExpr:
 		return expr.X.(*ast.Ident).Name + "."
+	case *ast.ParenExpr:
+		return expr.X.(*ast.Ident).Name + "."
 	case *ast.IndexListExpr:
 		return expr.X.(*ast.Ident).Name + "."
 	default:
diff --git a/testdata/script/parenthesized_expression.txtar b/testdata/script/parenthesized_expression.txtar
new file mode 100644
index 0000000..b544387
--- /dev/null
+++ b/testdata/script/parenthesized_expression.txtar
@@ -0,0 +1,20 @@
+! exec unparam .
+cmp stdout stdout.golden
+
+-- go.mod --
+module testdata.tld/foo
+
+go 1.18
+-- stdout.golden --
+foo.go:7:37: (*FooType).multImplsMethod - a is unused
+-- foo.go --
+package foo
+
+var DoWork func()
+
+type FooType int
+
+func (f *(FooType)) multImplsMethod(a int) int64 {
+	DoWork()
+	return 3
+}