Catch the message of VariableDuplicationError #1521
Merged
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ref: ruby/rbs#2310
RBS::InstanceVariableDuplicationError
andRBS::ClassInstanceVariableDuplicationError
have been introduced in rbs, but since Steep does not recognize these errors, it results in an Unexpected error.This PR fixes the issue so that Steep can properly display validation messages for these errors.
Message example