SIGSEGV with Golang 1.17.11

[itd0]

Hi,

go test github.com/chzyer/test fails as follows:

starting phase `check'
tmpdir: /tmp/guix-build-go-github-com-chzyer-test-1.0.0.drv-0
--- FAIL: TestMemDisk (0.00s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xb0 pc=0x53ae5c]

goroutine 20 [running]:
testing.tRunner.func1.2({0x554e80, 0x698b80})
	/gnu/store/d06665qgp3zqp05fr0q1sdbfnpvxywsc-go-1.17.11/lib/go/src/testing/testing.go:1209 +0x24e
testing.tRunner.func1()
	/gnu/store/d06665qgp3zqp05fr0q1sdbfnpvxywsc-go-1.17.11/lib/go/src/testing/testing.go:1212 +0x218
panic({0x554e80, 0x698b80})
	/gnu/store/d06665qgp3zqp05fr0q1sdbfnpvxywsc-go-1.17.11/lib/go/src/runtime/panic.go:1038 +0x215
github.com/chzyer/test.New({0x5a7b40, 0xc0000836c0})
	/tmp/guix-build-go-github-com-chzyer-test-1.0.0.drv-0/src/github.com/chzyer/test/test.go:77 +0x245
panic({0x554e80, 0x698b80})
	/gnu/store/d06665qgp3zqp05fr0q1sdbfnpvxywsc-go-1.17.11/lib/go/src/runtime/panic.go:1038 +0x215
github.com/chzyer/test.customEqual({0x0, 0x0}, {0x0, 0x0})
	/tmp/guix-build-go-github-com-chzyer-test-1.0.0.drv-0/src/github.com/chzyer/test/test.go:351 +0x11c
github.com/chzyer/test.equal(0x6a1ae0, {0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0, 0x550420})
	/tmp/guix-build-go-github-com-chzyer-test-1.0.0.drv-0/src/github.com/chzyer/test/test.go:336 +0x358
github.com/chzyer/test.Equals({0xc00008def8, 0x6, 0x5})
	/tmp/guix-build-go-github-com-chzyer-test-1.0.0.drv-0/src/github.com/chzyer/test/test.go:202 +0x73
github.com/chzyer/test.TestMemDisk(0x0)
	/tmp/guix-build-go-github-com-chzyer-test-1.0.0.drv-0/src/github.com/chzyer/test/disk_test.go:14 +0x225
testing.tRunner(0xc0000836c0, 0x5801a8)
	/gnu/store/d06665qgp3zqp05fr0q1sdbfnpvxywsc-go-1.17.11/lib/go/src/testing/testing.go:1259 +0x102
created by testing.(*T).Run
	/gnu/store/d06665qgp3zqp05fr0q1sdbfnpvxywsc-go-1.17.11/lib/go/src/testing/testing.go:1306 +0x35a
FAIL	github.com/chzyer/test	0.017s
FAIL
error: in phase 'check': uncaught exception:
%exception #<&invoke-error program: "go" arguments: ("test" "github.com/chzyer/test") exit-status: 1 term-signal: #f stop-signal: #f> 
phase `check' failed after 6.1 seconds
command "go" "test" "github.com/chzyer/test" failed with status 1

It seems to be unhappy about calling MethodByName on nil in:

test/test.go

Line 351 in df62958

method, ok := typeA.MethodByName("Equal")