tidy: remove redundant variable from check_if_error_code_is_test_in_explanation
tidy: remove redundant variable from check_if_error_code_is_test_in_explanation

graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust