Abstract
A technique-ASPECT-for catching code-level bugs is presented. ASPECT is intended to be economical for everyday software development. It comprises a formal specification language and a code-checking method. Programmers write simple assertions about the information required to compute a result; an efficient mechanical checker can then find bugs in the annotated code. Careless slips that escape type-checking and standard compiler anomaly tests can be detected, without the cost of formal verification or the uncertainty of testing. The essence of ASPECT is reasoning about dependencies between the aspects of abstract objects.<>

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