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parent 6057147fde962f2369c61f8dbf74dd2b1b2ce239
author kennytm <kennytm@gmail.com> 1544796617 +0800
committer kennytm <kennytm@gmail.com> 1544797063 +0800
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Rollup merge of #56748 - kinnison:kinnison/fix-56734, r=dtolnay

Update panic message to be clearer about env-vars

Esteban Kuber requested that the panic message make it clear
that `RUST_BACKTRACE=1` is an environment variable.  This change
makes that clear.

I understand that this may simply be closed if the concept isn't accepted, and I'd be fine with that :-)

Fixes #56734