From: Robert Findley <rfindley@google.com>
Date: Wed, 22 Sep 2021 00:58:33 +0000 (-0400)
Subject: go/types: add a test for argument error unwrapping
X-Git-Tag: go1.18beta1~1249
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e925c4640d52587e6657bccc40899888b657e6df;p=gostls13.git

go/types: add a test for argument error unwrapping

Add a sanity-check test that ArgumentErrors unwrap their inner Err.

Change-Id: I5a670a490deeabc03a64e42b3843f79d622ba958
Reviewed-on: https://go-review.googlesource.com/c/go/+/351338
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
---

diff --git a/src/go/types/api_test.go b/src/go/types/api_test.go
index d59d3d8923..f1a820988f 100644
--- a/src/go/types/api_test.go
+++ b/src/go/types/api_test.go
@@ -2012,6 +2012,20 @@ func TestInstantiateErrors(t *testing.T) {
 	}
 }
 
+func TestArgumentErrorUnwrapping(t *testing.T) {
+	var err error = &ArgumentError{
+		Index: 1,
+		Err:   Error{Msg: "test"},
+	}
+	var e Error
+	if !errors.As(err, &e) {
+		t.Fatalf("error %v does not wrap types.Error", err)
+	}
+	if e.Msg != "test" {
+		t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
+	}
+}
+
 func TestInstanceIdentity(t *testing.T) {
 	imports := make(testImporter)
 	conf := Config{Importer: imports}