представляти дерево двома типами: /// Операція для виконання над двома під-виразами. enum Operation { Add, Sub, Mul, Div, 70 } /// Вираз у вигляді дерева. enum Expression { /// Операція над двома підвиразами fn test_value() { .. } /// Операція для виконання над двома під-виразами. enum Operation { Add, Sub, Mul, Div, } /// Вираз у вигляді дерева. enum Expression { /// Операція над двома підвиразами. Op let term2 = Expression::Op { op: Operation::Mul, left: Box::new(Expression::Op { op: Operation::Sub, left: Box::new(Expression::Value(3)), right: Box::new(Expression::Value(4)), }), right: Box::new

� � � � � � � � � / / / An operation to perform on two subexpressions . enum Operation } Add , Sub , Mul , Div , { / / / An expression, in tree form . enum Expression } / / / An operation on two let term2 = Expression::Op } op: Operation::Mul , left: Box::new(Expression::Op } op: Operation::Sub , left: Box::new(Expression::Value(3 ( ( , right: Box::new(Expression::Value(4 ( ( , { ( , right: 12.5.1 � � � � � / / / An operation to perform on two subexpressions . enum Operation } Add , Sub , Mul , Div , { / / / An expression, in tree form . enum Expression } / / / An operation on two

Dependency management/caching * build scripting * global installation * It is also extensible with sub command plugins as well (such as cargo clippy). – Read more from the official Cargo Book 2.2 Code the tree with two types: /// An operation to perform on two subexpressions. enum Operation { Add, Sub, Mul, Div, } /// An expression, in tree form. enum Expression { /// An operation on two subexpressions fn test_value() { .. } /// An operation to perform on two subexpressions. enum Operation { Add, Sub, Mul, Div, } /// An expression, in tree form. enum Expression { /// An operation on two subexpressions

dependência de tempo de execução * Criar scripts * Instalação global * Também é extensível com plugins de sub-comando (tais como cargo clippy). – Leia mais no Livro Oficial do Cargo 20 2.2 Exemplos de Código vez de um pânico? /// Uma operação a ser realizada em duas subexpressões. enum Operation { Add, Sub, Mul, Div, } /// Uma expressão, em forma de árvore. enum Expression { /// Uma operação em duas subexpressões let term2 = Expression::Op { op: Operation::Mul, left: Box::new(Expression::Op { op: Operation::Sub, left: Box::new(Expression::Value(3)), right: Box::new(Expression::Value(4)), }), right: Box::new

un pánico? /// Operación que se puede llevar a cabo en dos subexpresiones. enum Operation { Add, Sub, Mul, Div, } /// Una expresión en forma de árbol. enum Expression { /// Operación en dos subexpresiones let term2 = Expression::Op { op: Operation::Mul, left: Box::new(Expression::Op { op: Operation::Sub, left: Box::new(Expression::Value(3)), right: Box::new(Expression::Value(4)), }), right: Box::new 1 Solución /// Operación que se puede llevar a cabo en dos subexpresiones. enum Operation { Add, Sub, Mul, Div, } /// Una expresión en forma de árbol. enum Expression { /// Operación en dos subexpresiones

Result instead of a panic? /// An operation to perform on two subexpressions. enum Operation { Add, Sub, Mul, Div, } /// An expression, in tree form. enum Expression { /// An operation on two subexpressions term2 = Expression::Op { 63 op: Operation::Mul, left: Box::new(Expression::Op { op: Operation::Sub, left: Box::new(Expression::Value(3)), right: Box::new(Expression::Value(4)), }), right: Box::new zero")) ); } 12.4.1 解答 /// An operation to perform on two subexpressions. enum Operation { Add, Sub, Mul, Div, } /// An expression, in tree form. enum Expression { /// An operation on two subexpressions

Result (而非恐 慌) 處理這種情況？ /// An operation to perform on two subexpressions. enum Operation { Add, Sub, Mul, Div, } /// An expression, in tree form. enum Expression { /// An operation on two subexpressions let term2 = Expression::Op { op: Operation::Mul, left: Box::new(Expression::Op { op: Operation::Sub, left: Box::new(Expression::Value(3)), right: Box::new(Expression::Value(4)), }), right: Box::new zero")) ); } 12.4.1 解決方案 /// An operation to perform on two subexpressions. enum Operation { Add, Sub, Mul, Div, } /// An expression, in tree form. enum Expression { /// An operation on two subexpressions

fillchar (default is a space). 在 2.4 版更改: Support for the fillchar argument. str.count(sub[, start[, end]]) 反回子字符串 sub 在 [start, end] 范围内非重叠出现的次数。可选参数 start 与 end 会被解读为切片表示 法。 str.decode([encoding[, errors]]) 012 0123 01234' str.find(sub[, start[, end]]) 返回子字符串 sub 在 s[start:end] 切片内被找到的最小索引。可选参数 start 与 end 会被解读为切片 表示法。如果 sub 未被找到则返回 -1。 注解: find() 方法应该只在你需要知道 sub 所在位置时使用。要检查 sub 是否为子字符串，请使用 in 操作符: >>> Operations in new code. 38 Chapter 5. 内置类型 The Python Library Reference, 发布 2.7.18 2.6 新版功能. str.index(sub[, start[, end]]) Like find(), but raise ValueError when the substring is not found. str.isalnum()

fillchar (default is a space). 在 2.4 版更改: Support for the fillchar argument. str.count(sub[, start[, end]]) 反回子字符串 sub 在 [start, end] 范围内非重叠出现的次数。可选参数 start 与 end 会被解读为切片表示 法。 str.decode([encoding[, errors]]) 012 0123 01234' str.find(sub[, start[, end]]) 返回子字符串 sub 在 s[start:end] 切片内被找到的最小索引。可选参数 start 与 end 会被解读为切片 表示法。如果 sub 未被找到则返回 -1。 注解: find() 方法应该只在你需要知道 sub 所在位置时使用。要检查 sub 是否为子字符串，请使用 in 操作符: >>> Operations in new code. 38 Chapter 5. 内置类型 The Python Library Reference, 发布 2.7.18 2.6 新版功能. str.index(sub[, start[, end]]) Like find(), but raise ValueError when the substring is not found. str.isalnum()

fillchar (default is a space). 在 2.4 版更改: Support for the fillchar argument. str.count(sub[, start[, end]]) 反回子字符串 sub 在 [start, end] 范围内非重叠出现的次数。可选参数 start 与 end 会被解读为切片表示 法。 str.decode([encoding[, errors]]) 012 0123 01234' str.find(sub[, start[, end]]) 返回子字符串 sub 在 s[start:end] 切片内被找到的最小索引。可选参数 start 与 end 会被解读为切片 表示法。如果 sub 未被找到则返回 -1。 注解: find() 方法应该只在你需要知道 sub 所在位置时使用。要检查 sub 是否为子字符串，请使用 in 操作符: >>> Operations in new code. 38 Chapter 5. 内置类型 The Python Library Reference, 发布 2.7.18 2.6 新版功能. str.index(sub[, start[, end]]) Like find(), but raise ValueError when the substring is not found. str.isalnum()