The National 5 language is almost fully implemented, modulo the following issues

Known bugs, omissions and issues (*** stops existing examples in manual from working)

• Are procedure calls a part of the N5 language? They are handled, but not typechecked as there are no standard procedures!
• Perhaps CS and CF errors should be separated/switchable for exam examples, particularly with elisions - or maybe something more inventive or interactive is possible.
• Should expressions over more than one line be allowed? They are not currently.
• RelOp: both operands should probably be scalars except for equality
• Elisions: special case of eg 5 < 6 AND 6 > 5 shows as an elision in the syntax colouring, although is parsed correctly
• input syntax DECLARE... AS .. INTIALLY FROM... is currently allowed but probably should not be
• currently both uppercase and lowercase boolean literals are allowed, eg FALSE or false; have previously been lowercase only but many new examples use uppercase
• centering the editor window to the first compiler error would be nice

If you discover others or have suggestions for improvement, please let me know via email