$ go test -cpu=1,1,1,1,1,1,1,1,1 encoding/json
--- FAIL: TestIndentBig (0.00 seconds)
        scanner_test.go:131: Indent(jsonBig) did not get bigger
On 4-th run initBig generates an empty array.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/49930051