som-snytt commented on pull request #32648:
URL: https://github.com/apache/spark/pull/32648#issuecomment-847756599
Sample for wconf, where `i` says "info", `s` would be silence. It warns
about deprecation but outer check is just info.
```
➜ snips scalac -d /tmp -Xlint "-Wconf:cat=unchecked&msg=outer reference:i"
-Werror badcheck.scala
badcheck.scala:11: warning: method g in class C is deprecated (since 0.1):
bad g
def x = g + 1
^
badcheck.scala:7: The outer reference in this type test cannot be checked at
run time.
case _: U => true
^
error: No warnings can be incurred under -Werror.
1 warning
1 error
➜ snips cat badcheck.scala
class C {
trait T
trait U
def f(t: T) = t match {
case _: U => true
case _ => false
}
@deprecated("bad g", "0.1") def g = 42
def x = g + 1
}
```
I have to re-read `-Wconf:help` if I use it.
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