Easy: Concept parameter mode usage checking (10 hrs)

[AdityaSenthilvel]

Check misuse of # notation in the ensures clause wrt parameter mode. These may be warnings as opposed to errors.

[drholly77]

@rhit-csse-projects/t17-2425 Suppose there is a parameter X When to issue a warning by different parameter modes:

1. restores X or preserves X or evaluates X: issue a warning if the ensures clause includes a #X
2. replaces X: issue a warning if there is a #X in the ensures clause
3. alters X: issue a warning if there is an X (i.e., w/o the #) in the ensures clause
4. updates X or clears X: issue no warnings for these modes

Explanation:

1. These parameter modes all mean that X = #X, i.e., the outgoing X is equal to the incoming X
2. The replaces mode means that the operation ignores the incoming value
3. The alters mode means that the outgoing value is unspecified

[rhit-koenigjl]

• [ ] Write Unit tests to understand Exp.java and it's related things.
• [ ] Write tests to check for variables within an expression.
• [ ] Locate implementation location for raising warnings
• [ ] Raise warnings and add to .asrt output files

Useful Classes:

• AssertionClause.java
• Exp.java