19 files changed, 132 insertions, 13 deletions
diff --git a/test/files/neg/forgot-interpolator.check b/test/files/neg/forgot-interpolator.check
index 8988458982..8e75350518 100644
--- a/test/files/neg/forgot-interpolator.check
+++ b/test/files/neg/forgot-interpolator.check
@@ -1,25 +1,25 @@
-forgot-interpolator.scala:4: warning: `$bippy` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:4: warning: possible missing interpolator: detected interpolated identifier `$bippy`
   def f = "Put the $bippy in the $bippy!" // warn 1
           ^
-forgot-interpolator.scala:14: warning: That looks like an interpolated expression! Did you forget the interpolator?
+forgot-interpolator.scala:14: warning: possible missing interpolator: detected an interpolated expression
   def f = """Put the ${println("bippy")} in the bippy!""" // warn 2
           ^
-forgot-interpolator.scala:30: warning: `$beppo` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:30: warning: possible missing interpolator: detected interpolated identifier `$beppo`
       def f = "$beppo was a marx bros who saw dollars."  // warn 3
               ^
-forgot-interpolator.scala:34: warning: `$aleppo` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:34: warning: possible missing interpolator: detected interpolated identifier `$aleppo`
     def f = "$aleppo is a pepper and a city."     // warn 4
             ^
-forgot-interpolator.scala:47: warning: `$hippo` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:47: warning: possible missing interpolator: detected interpolated identifier `$hippo`
     def h = "$hippo takes an implicit"  // warn 6
             ^
-forgot-interpolator.scala:88: warning: `$groucho` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:88: warning: possible missing interpolator: detected interpolated identifier `$groucho`
     def f2 = "I salute $groucho" // warn 7
              ^
-forgot-interpolator.scala:89: warning: `$dingo` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:89: warning: possible missing interpolator: detected interpolated identifier `$dingo`
     def f3 = "I even salute $dingo" // warn 8
              ^
-forgot-interpolator.scala:90: warning: `$calico` looks like an interpolated identifier! Did you forget the interpolator?
+forgot-interpolator.scala:90: warning: possible missing interpolator: detected interpolated identifier `$calico`
     def f4 = "I also salute $calico" // warn 9
              ^
 error: No warnings can be incurred under -Xfatal-warnings.
diff --git a/test/files/neg/t4851.flags b/test/files/neg/t4851.flags
index ca0d0a0ba3..044ce22c84 100644
--- a/test/files/neg/t4851.flags
+++ b/test/files/neg/t4851.flags
@@ -1 +1 @@
--Ywarn-adapted-args -Xfatal-warnings -deprecation
+-Xlint:adapted-args -Xfatal-warnings -deprecation
diff --git a/test/files/neg/t7848-interp-warn.check b/test/files/neg/t7848-interp-warn.check
index b7df6d8ce2..4cf9d55ffd 100644
--- a/test/files/neg/t7848-interp-warn.check
+++ b/test/files/neg/t7848-interp-warn.check
@@ -1,10 +1,10 @@
-t7848-interp-warn.scala:8: warning: `$foo` looks like an interpolated identifier! Did you forget the interpolator?
+t7848-interp-warn.scala:8: warning: possible missing interpolator: detected interpolated identifier `$foo`
     "An important $foo message!"
     ^
-t7848-interp-warn.scala:12: warning: That looks like an interpolated expression! Did you forget the interpolator?
+t7848-interp-warn.scala:12: warning: possible missing interpolator: detected an interpolated expression
     "A doubly important ${foo * 2} message!"
     ^
-t7848-interp-warn.scala:16: warning: `$bar` looks like an interpolated identifier! Did you forget the interpolator?
+t7848-interp-warn.scala:16: warning: possible missing interpolator: detected interpolated identifier `$bar`
   def j = s"Try using '${ "something like $bar" }' instead."  // warn
                           ^
 error: No warnings can be incurred under -Xfatal-warnings.
diff --git a/test/files/neg/t8035-no-adapted-args.check b/test/files/neg/t8035-no-adapted-args.check
new file mode 100644
index 0000000000..43637b2c1f
--- /dev/null
+++ b/test/files/neg/t8035-no-adapted-args.check
@@ -0,0 +1,21 @@
+t8035-no-adapted-args.scala:4: warning: No automatic adaptation here: use explicit parentheses.
+        signature: Test.f[T](x: T): Int
+  given arguments: 1, 2, 3
+ after adaptation: Test.f((1, 2, 3): (Int, Int, Int))
+  f(1, 2, 3)
+   ^
+t8035-no-adapted-args.scala:4: error: too many arguments for method f: (x: (Int, Int, Int))Int
+  f(1, 2, 3)
+   ^
+t8035-no-adapted-args.scala:5: warning: No automatic adaptation here: use explicit parentheses.
+        signature: Test.f[T](x: T): Int
+  given arguments: <none>
+ after adaptation: Test.f((): Unit)
+  f()
+   ^
+t8035-no-adapted-args.scala:5: error: not enough arguments for method f: (x: Unit)Int.
+Unspecified value parameter x.
+  f()
+   ^
+two warnings found
+two errors found
diff --git a/test/files/neg/t8035-no-adapted-args.flags b/test/files/neg/t8035-no-adapted-args.flags
new file mode 100644
index 0000000000..b3e8c505e2
--- /dev/null
+++ b/test/files/neg/t8035-no-adapted-args.flags
@@ -0,0 +1 @@
+-Yno-adapted-args
+\ No newline at end of file
diff --git a/test/files/neg/t8035-no-adapted-args.scala b/test/files/neg/t8035-no-adapted-args.scala
new file mode 100644
index 0000000000..82690ebe94
--- /dev/null
+++ b/test/files/neg/t8035-no-adapted-args.scala
@@ -0,0 +1,6 @@
+object Test {
+  def f[T](x: T) = 0
+
+  f(1, 2, 3)
+  f()
+}
diff --git a/test/files/neg/t8525.check b/test/files/neg/t8525.check
new file mode 100644
index 0000000000..5287e43b7a
--- /dev/null
+++ b/test/files/neg/t8525.check
@@ -0,0 +1,15 @@
+t8525.scala:7: warning: Adapting argument list by creating a 2-tuple: this may not be what you want.
+        signature: X.f(p: (Int, Int)): Int
+  given arguments: 3, 4
+ after adaptation: X.f((3, 4): (Int, Int))
+  def g = f(3, 4)       // adapted
+           ^
+t8525.scala:9: warning: private[this] value name in class X shadows mutable name inherited from class Named.  Changes to name will not be visible within class X - you may want to give them distinct names.
+  override def toString = name // shadowing mutable var name
+                          ^
+t8525.scala:8: warning: side-effecting nullary methods are discouraged: suggest defining as `def u()` instead
+  def u: Unit = ()      // unitarian universalist
+      ^
+error: No warnings can be incurred under -Xfatal-warnings.
+three warnings found
+one error found
diff --git a/test/files/neg/t8525.flags b/test/files/neg/t8525.flags
new file mode 100644
index 0000000000..53b2dfe7ec
--- /dev/null
+++ b/test/files/neg/t8525.flags
@@ -0,0 +1 @@
+-Xfatal-warnings -Xlint:-missing-interpolator -Xlint
diff --git a/test/files/neg/t8525.scala b/test/files/neg/t8525.scala
new file mode 100644
index 0000000000..7bed04904f
--- /dev/null
+++ b/test/files/neg/t8525.scala
@@ -0,0 +1,10 @@
+
+class Named(var name: String)
+
+class X(name: String) extends Named(name) {
+  def x = "Hi, $name"   // missing interp
+  def f(p: (Int, Int)): Int = p._1 * p._2
+  def g = f(3, 4)       // adapted
+  def u: Unit = ()      // unitarian universalist
+  override def toString = name // shadowing mutable var name
+}
diff --git a/test/files/neg/t8610-arg.check b/test/files/neg/t8610-arg.check
new file mode 100644
index 0000000000..d6fe207119
--- /dev/null
+++ b/test/files/neg/t8610-arg.check
@@ -0,0 +1,6 @@
+t8610-arg.scala:8: warning: side-effecting nullary methods are discouraged: suggest defining as `def u()` instead
+  def u: Unit = ()      // unitarian universalist
+      ^
+error: No warnings can be incurred under -Xfatal-warnings.
+one warning found
+one error found
diff --git a/test/files/neg/t8610-arg.flags b/test/files/neg/t8610-arg.flags
new file mode 100644
index 0000000000..f331ba9383
--- /dev/null
+++ b/test/files/neg/t8610-arg.flags
@@ -0,0 +1 @@
+-Xfatal-warnings -Xlint nullary-unit
diff --git a/test/files/neg/t8610-arg.scala b/test/files/neg/t8610-arg.scala
new file mode 100644
index 0000000000..7bed04904f
--- /dev/null
+++ b/test/files/neg/t8610-arg.scala
@@ -0,0 +1,10 @@
+
+class Named(var name: String)
+
+class X(name: String) extends Named(name) {
+  def x = "Hi, $name"   // missing interp
+  def f(p: (Int, Int)): Int = p._1 * p._2
+  def g = f(3, 4)       // adapted
+  def u: Unit = ()      // unitarian universalist
+  override def toString = name // shadowing mutable var name
+}
diff --git a/test/files/neg/t8610.check b/test/files/neg/t8610.check
new file mode 100644
index 0000000000..334a947549
--- /dev/null
+++ b/test/files/neg/t8610.check
@@ -0,0 +1,18 @@
+t8610.scala:5: warning: possible missing interpolator: detected interpolated identifier `$name`
+  def x = "Hi, $name"   // missing interp
+          ^
+t8610.scala:7: warning: Adapting argument list by creating a 2-tuple: this may not be what you want.
+        signature: X.f(p: (Int, Int)): Int
+  given arguments: 3, 4
+ after adaptation: X.f((3, 4): (Int, Int))
+  def g = f(3, 4)       // adapted
+           ^
+t8610.scala:9: warning: private[this] value name in class X shadows mutable name inherited from class Named.  Changes to name will not be visible within class X - you may want to give them distinct names.
+  override def toString = name // shadowing mutable var name
+                          ^
+t8610.scala:8: warning: side-effecting nullary methods are discouraged: suggest defining as `def u()` instead
+  def u: Unit = ()      // unitarian universalist
+      ^
+error: No warnings can be incurred under -Xfatal-warnings.
+four warnings found
+one error found
diff --git a/test/files/neg/t8610.flags b/test/files/neg/t8610.flags
new file mode 100644
index 0000000000..954eaba352
--- /dev/null
+++ b/test/files/neg/t8610.flags
@@ -0,0 +1 @@
+-Xfatal-warnings -Xlint
diff --git a/test/files/neg/t8610.scala b/test/files/neg/t8610.scala
new file mode 100644
index 0000000000..7bed04904f
--- /dev/null
+++ b/test/files/neg/t8610.scala
@@ -0,0 +1,10 @@
+
+class Named(var name: String)
+
+class X(name: String) extends Named(name) {
+  def x = "Hi, $name"   // missing interp
+  def f(p: (Int, Int)): Int = p._1 * p._2
+  def g = f(3, 4)       // adapted
+  def u: Unit = ()      // unitarian universalist
+  override def toString = name // shadowing mutable var name
+}
diff --git a/test/files/neg/t8736-c.check b/test/files/neg/t8736-c.check
new file mode 100644
index 0000000000..06b2228543
--- /dev/null
+++ b/test/files/neg/t8736-c.check
@@ -0,0 +1,11 @@
+t8736-c.scala:4: warning: higher-kinded type should be enabled
+by making the implicit value scala.language.higherKinds visible.
+This can be achieved by adding the import clause 'import scala.language.higherKinds'
+or by setting the compiler option -language:higherKinds.
+See the Scala docs for value scala.language.higherKinds for a discussion
+why the feature should be explicitly enabled.
+  def hk[M[_]] = ???
+         ^
+error: No warnings can be incurred under -Xfatal-warnings.
+one warning found
+one error found
diff --git a/test/files/neg/t8736-c.flags b/test/files/neg/t8736-c.flags
new file mode 100644
index 0000000000..fde5313c96
--- /dev/null
+++ b/test/files/neg/t8736-c.flags
@@ -0,0 +1 @@
+-feature -language:-higherKinds,_ -Xfatal-warnings
diff --git a/test/files/neg/t8736-c.scala b/test/files/neg/t8736-c.scala
new file mode 100644
index 0000000000..8432775ae1
--- /dev/null
+++ b/test/files/neg/t8736-c.scala
@@ -0,0 +1,7 @@
+// scalac: -feature -language:-higherKinds,_ -Xfatal-warnings
+// showing that wildcard doesn't supersede explicit disablement
+class X {
+  def hk[M[_]] = ???
+
+  implicit def imp(x: X): Int = x.hashCode
+}
diff --git a/test/files/neg/warn-inferred-any.flags b/test/files/neg/warn-inferred-any.flags
index a3127d392a..b580dfbbe3 100644
--- a/test/files/neg/warn-inferred-any.flags
+++ b/test/files/neg/warn-inferred-any.flags
@@ -1 +1 @@
--Xfatal-warnings -Ywarn-infer-any
+-Xfatal-warnings -Xlint:infer-any