SMV: KNOWNBUG test for bare section headers#1995
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Bare TRANS/INIT/INVAR/FAIRNESS/SPEC/CTLSPEC/LTLSPEC headers are accepted as empty sections (parser.y:447). Truncated or malformed SMV input can silently weaken the model instead of failing with a parse error. NuSMV intentionally accepts bare section keywords as valid syntax: each constraint kind is conjoined (T = T1 ∧ T2 ∧ ... ∧ Tn), and an empty section contributes TRUE (the identity element) to the conjunction. While this matches NuSMV's permissive grammar, it is a robustness defect in practice — a truncated file or copy-paste error that leaves a dangling keyword will silently produce a weaker model with missing constraints or properties, with no diagnostic.
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Bare
TRANS/INIT/INVAR/FAIRNESS/SPEC/CTLSPEC/LTLSPECheaders are accepted as empty sections (parser.y:447). Truncated or malformed SMV input can silently weaken the model instead of failing with a parse error.This adds a
KNOWNBUGregression test documenting the issue. The parser currently silently accepts these bare keywords, which means a truncated or accidentally incomplete SMV file will parse successfully but with missing constraints/properties — potentially making verification unsound.