Expression {SMRUCC.Rsharp.Interpreter.ExecuteEngine} | .NET clr documentation

## Expression

### Description

An expression object model in R# language interpreter

### Declare

    # namespace SMRUCC.Rsharp.Interpreter.ExecuteEngine
    export class Expression {
       # debug used...
       expressionName: ExpressionTypes;
       # is a function?
       isCallable: boolean;
       # 推断出的这个表达式可能产生的值的类型
       type: TypeCodes;
    }

### .NET clr type reference tree

1. use by property member `expressionName`: ExpressionTypes
2. use by property member `type`: TypeCodes

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