Implement Display and Error for EvalErr

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 5814142434

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 93.832%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/reduction.rs	0	3	0.0%
<!--	Total:	0	3	0.0%	-->

Totals
Change from base Build 5513827559:	-0.05%
Covered Lines:	5218
Relevant Lines:	5561

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💛 - Coveralls