TestGoldenFiles fails with Go 1.5 tip

[mwhudson]

mwhudson@glamdring:ogletest$ go version
go version devel +0acecb7 Wed Jul 22 20:27:24 2015 +0000 linux/amd64
mwhudson@glamdring:ogletest$ go test ./...
--- FAIL: TestGoldenFiles (5.32s)
    integration_test.go:262: Output for test case panicking doesn't match golden file.
FAIL
FAIL    github.com/jacobsa/ogletest 5.322s
ok      github.com/jacobsa/ogletest/srcutil 0.001s
?       github.com/jacobsa/ogletest/test_cases  [no test files]
?       github.com/jacobsa/ogletest/test_cases/mock_image   [no test files]
mwhudson@glamdring:ogletest$ go version
go version devel +0acecb7 Wed Jul 22 20:27:24 2015 +0000 linux/amd64
mwhudson@glamdring:ogletest$ go test -v github.com/jacobsa/ogletest
=== RUN   TestNoCurrentTest
--- PASS: TestNoCurrentTest (0.00s)
=== RUN   TestNoFailure
--- PASS: TestNoFailure (0.00s)
=== RUN   TestInvalidFormatString
--- PASS: TestInvalidFormatString (0.00s)
=== RUN   TestNoMatchWithoutErrorText
--- PASS: TestNoMatchWithoutErrorText (0.00s)
=== RUN   TestNoMatchWithErrorTExt
--- PASS: TestNoMatchWithErrorTExt (0.00s)
=== RUN   TestFailureWithUserMessage
--- PASS: TestFailureWithUserMessage (0.00s)
=== RUN   TestAdditionalFailure
--- PASS: TestAdditionalFailure (0.00s)
=== RUN   TestGoldenFiles
--- FAIL: TestGoldenFiles (4.16s)
    integration_test.go:262: Output for test case panicking doesn't match golden file.
FAIL
exit status 1
FAIL    github.com/jacobsa/ogletest 4.165s

I guess the details of what is printed after a panic has changed, I haven't actually looked.