refactoring workflow AST to facilitate runtime dependency analysis #195
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WorkflowNodeas a base class forDecl,Call,Scatter, andConditional. Each workflow node has a string ID (unique within the workflow) and reports the IDs of its dependencies.ScatterandConditionalinheritWorkflowSection : WorkflowNodewhich centralizes access to theGathernodes.{Workflow,Scatter,Conditional}.elementsto.bodyThe typechecker and cycle detection are unchanged, but probably can be simplified by using these new constructs (especially the gathers for typechecking).