Reorder injection of std to get better compilation error

[rcoh]

Per #49851, reorder injection imports to get a better error message.

r? @oli-obk

[rust-highfive]

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[oli-obk]

@bors r+

Thanks.

I didn't know about the error syntax with line info. That's really funky

[bors]

📌 Commit 084d2bc has been approved by oli-obk

[bors]

⌛ Testing commit 084d2bc with merge c8fa49f...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: oli-obk
Pushing c8fa49f to master...