Mix uses its own copy of rebar placed in $MIX_HOME/rebar and $MIX_HOME/rebar3, by default $MIX_HOME is ~/.mix. This is done, so that we can verify a concrete version of rebar works fine with mix and does not have any bugs - in case such bugs are discovered, it’s also easier to update. It removes one variable (version of rebar) when debugging issues with mix.
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