如何正确使用 scalac -Xlint

Question

scalax -Xlint 帮助提供以下信息：

$ scalac -Xlint:help
Enable or disable specific warnings
  adapted-args               Warn if an argument list is modified to match the receiver.
  nullary-unit               Warn when nullary methods return Unit.
  inaccessible               Warn about inaccessible types in method signatures.
  nullary-override           Warn when non-nullary `def f()' overrides nullary `def f'.
  infer-any                  Warn when a type argument is inferred to be `Any`.
  missing-interpolator       A string literal appears to be missing an interpolator id.
  doc-detached               A Scaladoc comment appears to be detached from its element.
  private-shadow             A private field (or class parameter) shadows a superclass field.
  type-parameter-shadow      A local type parameter shadows a type already in scope.
  poly-implicit-overload     Parameterized overloaded implicit methods are not visible as view bounds.
  option-implicit            Option.apply used implicit view.
  delayedinit-select         Selecting member of DelayedInit.
  by-name-right-associative  By-name parameter of right associative operator.
  package-object-classes     Class or object defined in package object.
  unsound-match              Pattern match may not be typesafe.
  stars-align                Pattern sequence wildcard must align with sequence component.

有没有办法启用所有检查？ scalac -Xlint 的语义是什么？它会启用所有吗？默认设置（哪个）？什么都不做？

Note: Scala 2.11.8 and sbt 0.13.9

If newer versions provide different behaviour/features let me know, as updating them is not a problem

Answer 1

-Xlint currently means -Xlint:_, but that needs to be made explicit.

从历史上看，总是有一些警告过于嘈杂或不可靠而无法默认启用，因此总是有一些警告被排除在 -Xlint 之外。

目前有 one such lintable，但它没有连接到命令行选项。

曾经有一个 -Ywarn-all 表示 -Xlint 加上其他警告。该选项消失的原因并不明显。

曾一度，-Xlint:_ 表示 -Ywarn-all，-Xlint 表示推荐的子集，但事实证明人们喜欢禁用一两个 lint 规则使用 -Xlint:-annoying,_，如果任意启用许多其他嘈杂的 lint 规则，则更难做到。

通常，scalac -X 显示默认值；但可能 scalac -Xlint:help 会得到改进以显示其默认行为。对于 -Yopt.

之类的内容，该默认值并不重要

$ scalac -help
Usage: scalac <options> <source files>
where possible standard options include:
  -X                              Print a synopsis of advanced options.


$ scalac -X
Usage: scalac <options> <source files>

-- Notes on option parsing --
Boolean settings are always false unless set.
Where multiple values are accepted, they should be comma-separated.
  example: -Xplugin:option1,option2
<phases> means one or a comma-separated list of:
  (partial) phase names, phase ids, phase id ranges, or the string "all".
  example: -Xprint:all prints all phases.
  example: -Xprint:expl,24-26 prints phases explicitouter, closelim, dce, jvm.
  example: -Xprint:-4 prints only the phases up to typer.

Possible advanced options include:
  -Xlint:<_,warning,-warning>    Enable or disable specific warnings: `_' for all, `-Xlint:help' to list

如何正确使用 scalac -Xlint

How to properly use scalac -Xlint

scala

compiler-flags

scalac

scala-compiler