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Lustre is a dataflow synchronous programming language designed for safety-critical real-time systems. The language was initially developed in the 1980s by the French National Institute for Research in Computer Science and Automation (INRIA) as a part of the SCADE software suite. Its syntax is declarative, letting programmers describe systems as networks of equations that define how data flows through the system over time. This makes it well-suited to applications where predictability and correctness are crucial, such as avionics, nuclear power plants, and railway signaling systems. Programmers commonly use Lustre together with other formal methods in safety analysis processes to verify that systems will operate correctly under all conditions. In practice, Lustre has been used within tools like SCADE Suite KCG (Verifiers/Compilers) which compiles high-level modeling using block diagrams into efficient C code or VHDL/Verilog for hardware synthesis targeting embedded control devices.

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