static const [FRigVMVarExprAST](API\Plugins\RigVMDeveloper\RigVMCompiler\FRigVMVarExprAST) * GetSourceVarExpr ( const [FRigVMExprAST](API\Plugins\RigVMDeveloper\RigVMCompiler\FRigVMExprAST) * InExpr )