time: misleading error message froms Parse for initial element missing leading zeroes

[tredoe]

What version of Go are you using (go version)?

$ go version
go version go1.11.4 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

Parsing the month-day "1-03" with layout "01-02".
https://play.golang.org/p/7bfuFfjG7nJ

What did you expect to see?

At the last part of the error i=1: cannot parse "1" as "01"

What did you see instead?

month out of range

[gopherbot]

Change https://golang.org/cl/160338 mentions this issue: time: fix misleading error for leading zero format

[gopherbot]

Change https://golang.org/cl/160479 mentions this issue: time: fix parsing issue for improper month value

[gopherbot]

Change https://golang.org/cl/163260 mentions this issue: time: fix parse month error message

[dmitshur]

It looks like there are 3 CLs open for review that are all trying to resolve this issue:

• CL 160338
• CL 160479
• CL 163260

To make progress on this issue, those CLs should be reviewed.