优先级
从上往下，优先级越低。
| 优先级 | 标题 | 符号 |
|---|---|---|
| 高优先 | Postfix | ++, --, ., ?., ? |
| Prefix | -, +, ++, --, !, label | |
| Type RHS | :, as, as? | |
| Multiplicative | *, /, % | |
| Additive | +, - | |
| Range | .. | |
| Infix function | simpleIdentifier | |
| Elvis | ?: | |
| Named checks | in, !in, is, !is | |
| Comparison | <, >, <=, >= | |
| Equality | ==, !== | |
| Conjunction | && | |
| Disjunction | || | |
| Spread operator | * | |
| 低优先 | Assignment | =, +=, -=, *=, /=, %= |
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