Contains definition of InnerExpr traits.
| Action | Defines expr with configuration (ApplyType, MoveType).
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| InitialExpr | InitialExpr used to define initial expression.
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| ActionExpr | ActionExpr is Action one of type Process, Initial or Err.
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| ActionType | ActionType defines action of 3 types: Initial (InitialExpr), Process (ProcessExpr), Err (ErrExpr).
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| ApplyType | ApplyType defines two types of action: Instant and Deferred. Instant means that action will be applied
instantly, deferred means that it will wait for all actions in current step to be finished.
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| ErrExpr | ErrExpr used to define types of expression which will be evaluated in case of Err or None.
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| MoveType | MoveType defines nested combinator types.
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| ProcessExpr | ProcessExpr used to define type of expressions in process position.
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| InnerExpr | Provides functionality to get or replace inner Expr(s).
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