api: go1.5beta3 API check exit status 1

[ajstarks]

on Mac OS X 10.10.4:

##### API check
Error running API checker: exit status 1
Go version is "go1.5beta3", ignoring -next /Users/ajstarks/go/api/next.txt
+pkg encoding/json, method (*Decoder) More() bool
+pkg encoding/json, method (*Decoder) Token() (Token, error)
+pkg encoding/json, method (Delim) String() string
+pkg encoding/json, type Delim int32
+pkg encoding/json, type Token interface {}
+pkg runtime, type MemStats struct, GCCPUFraction float64
exit status 1
2015/07/30 05:14:15 Failed: exit status 1

[bradfitz]

https://go-review.googlesource.com/12769

[gopherbot]

CL https://golang.org/cl/12769 mentions this issue.