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This is gated behind the
debug
feature flag so only explicit debuggingcases pay the build time and runtime costs.
The builder API's stack traces are generally not too interesting. Where
this really helps is with
clap_derive
. We currently panic onunexpected conditions which at least gives us a backtrace. We'd like to
turn these into errors but to do so would lose those debuggin
backtraces, which is where this comes in.
This is a part of #2255