Scala 的关键字共有 39 个，在 Scala 中保留关键字不能作为常量或变量或其他用户自定义标示符。
下表列出了 scala 保留关键字：
| abstract | case | catch | class |
|---|---|---|---|
| def | do | else | extends |
| false | final | finally | for |
| forSome | if | implicit | import |
| lazy | match | new | null |
| object | override | package | private |
| protected | return | sealed | super |
| this | throw | trait | try |
| true | type | val | var |
| while | with | yield | |
| - | : | = | => |
| <- | <: | <% | >: |
| # | @ |
