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* feat(reporters): match attribute expressions for proper code line reporting
* feat(equal): enable show_diff report in operator
* fix(index_test): bad file formatting
* refactor(index_test): add error test case
* refactor(index_test): remove commented code
* feat(docs): add context assertion example in tutorial
* feat(docs): add context manager example
* fix(docs): update error exception example
* refactor(docs): update showcase example
* feat(operators): add not_satisfy attribute operator