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basic language for implementation of system software : FOLDOC | Basic Language for Implementation of System Software (BLISS, or allegedly, "System Software Implementation Language, Backwards") A language designed by W.A. Wulf at CMU around 1969. BLISS is an {expression language}. It is block-structured, and typeless, with {exception handling} facilities, {coroutines}, a macro system, and a highly optimising compiler. It was one of the first non-assembly languages for operating system implementation. It gained fame for its lack of a goto and also lacks implicit dereferencing: all symbols stand for addresses, not values. Another characteristic (and possible explanation for the backward acronym) was that BLISS fairly uniformly used backward keywords for closing blocks, a famous example being ELUDOM to close a MODULE. An exception was BEGIN...END though you could use (...) instead. DEC introduced the NOVALUE keyword in their dialects to allow statements to not return a value. Versions: CMU BLISS-10 fo
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