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DRAGON Semantic Checklist
=========================
[ ] 1. Semantic rules for Scoping
[ ] 1.1. Local objects cannot be declared more than once
[ ] 1.2. Local objects hide non-local objects with the same name
[ ] 1.3. Non-local objects should be visible from inner scopes (unless a local object of the same name exists)
[ ] 1.4. Function and procedure names exist in the scope they are defined (and not in their own scopes)
[ ] 1.5. Local objects cease to exist once their scopes cease to exist
[ ] 2. Semantic rules for Expressions
[ ] 2.1. Expressions return typed-values
[ ] 2.2. Objects must be declared before they used in expressions
[ ] 2.3. Objects of different types cannot appear in the same expression (no type promotions)
[ ] 3. Semantic rules for Statements
[ ] 3.1. Statements do not return values
[ ] 3.2. The test expression for IF-THEN, IF-THEN-ELSE, WHILE-DO must be Boolean-valued;
[ ] note that the Boolean type must be implicitly defined
[ ] 3.3. The ELSE clause always binds to the closest IF (resolution of the dangling ELSE problem)
[ ] 3.4. The variable type in FOR-DO must match the types of lower bound and upper bound expressions
[ ] 4. Semantic rules for Arrays
[ ] 4.1. Non-integer valued expressions cannot be used for indexing arrays
[ ] 5. Semantic rules for Functions
[ ] 5.1. Function calls return values of type Integer or Real
[ ] 5.2. Function must contain a "return" statement within its own body;
[ ] this is of the form: <function_name> := <expression>
[ ] 5.3. Functions must accept exactly the same number of arguments as is
[ ] declared in its header, with the correct sequence of types
[X] 5.4. Functions are not allowed to update the value of nonlocal objects (via assignment statements)
[ ] 6. Semantic rules for Procedures
[ ] 6.1. Procedure calls do not return values
[ ] 6.2. Procedures must accept exactly the same number of arguments as is
[ ] declared in its header, with the correct sequence of types
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