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The @deftypevr command is the general definition command for something like a variable in a typed language - - an entity that records a value . Although the basic calculus of units , including a type system and operational semantics , has been worked out , the system has not been implemented for a typed functional language . She acknowledged that the pass mark originally had been shown as 60 % ( in a typed entry ) , but was incorrect and had never been used . Format a description for something like a variable in a typed language - - an entity that records a value . The aim of this course is to lay out in detail the design of type assignment systems for programming languages and focus on the importance of a sound theoretical framework , in order to be able to reason about the properties of a typed program .