Programs that are syntactically well-formed are not necessarily valid programs. Programming languages typically impose additional context-sensitive requirements on programs that cannot be captured in a syntax definition. Languages use names to identify reusable units that can be invoked at multiple parts in a program. In addition, statically typed languages require that expressions are consistently typed. The Statix language supports the specification of name binding and type checking rules of a language. The rules of the static semantics are written as logic rules, and solved using a constraint-based approach, and uses scope graphs for name resolution.
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