tree c3d790f50edd629f3ae5e6e0223f7338d70449a1
parent 3499575282b5cda1e98220baae4f6c87e1863926
author Daniel Silverstone <dsilvers@digital-scurf.org> 1544624449 +0000
committer Daniel Silverstone <dsilvers@digital-scurf.org> 1544742424 +0000

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.  Wording provided in part by David Tolnay.