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Disallow variable redefinition in fault trees #57

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Disallow variable redefinition in fault trees #57

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3 changes: 1 addition & 2 deletions mef/fault_tree_layer.rst
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Expand Up @@ -60,8 +60,7 @@ This description allows loops (in the sense defined above),
multiple definitions and trees with multiple top events.
The presence of loops must be detected by a specific check procedure.
If a variable or a parameter is declared more than once,
tools should emit a warning
and consider only the last definition as the good one (the previous ones are just ignored).
tools should emit an error (consistent with the declarative nature of the language).
In some circumstances, it is of interest to define several fault trees at once
by means of a unique set of declarations.
Therefore, the presence of multiple top events should not be prevented.
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