chore: fix warnings on nightly #558
Merged
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This PR fixes two types of warnings:
std::error::Error
.extern crate proc_macro
in tracing-attributes. This does not occur on the stable release of1.41
, but it does occur on1.42.0-beta.1
and1.42.0-nightly (cd1ef390e 2020-01-31)
.Prior to merging this PR, I'd like to determine whether the second warning is a deliberate change or a regression.