SI-8040 No warn args to super, main args

`class B(x: X) extends A(x)` uses `x` in ctor,
where it is detectable as an ordinary param.

`implicit class C(val s: String)` may not
use `s` in extension methods, so don't warn.

Don't warn required args to main method.

Don't warn about synthetic isDefinedAt in
anonymous functions, or about defaultCase$.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/files/neg/warn-unused-params.check b/test/files/neg/warn-unused-params.check
index ca6320ccd9..373417ce08 100644
--- a/test/files/neg/warn-unused-params.check
+++ b/test/files/neg/warn-unused-params.check
@@ -7,10 +7,10 @@ warn-unused-params.scala:32: warning: parameter value s in method i is never use
 warn-unused-params.scala:49: warning: parameter value u in class Unusing is never used
 class Unusing(u: Int) {       // warn
               ^
-warn-unused-params.scala:57: warning: parameter value s in class CaseyAtTheBat is never used
+warn-unused-params.scala:59: warning: parameter value s in class CaseyAtTheBat is never used
 case class CaseyAtTheBat(k: Int)(s: String)        // warn
                                  ^
-warn-unused-params.scala:60: warning: parameter value readResolve in method f is never used
+warn-unused-params.scala:62: warning: parameter value readResolve in method f is never used
   def f(readResolve: Int) = 42           // warn
         ^
 error: No warnings can be incurred under -Xfatal-warnings.