9 files changed, 64 insertions, 0 deletions
diff --git a/test/files/neg/t8610-arg.check b/test/files/neg/t8610-arg.check
new file mode 100644
index 0000000000..f2879b0d45
--- /dev/null
+++ b/test/files/neg/t8610-arg.check
@@ -0,0 +1,9 @@
+t8610-arg.scala:3: warning: `$name` looks like an interpolated identifier! Did you forget the interpolator?
+  def x = "Hi, $name"   // missing interp
+          ^
+t8610-arg.scala:6: 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.
+two warnings 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..f8867a7b4e
--- /dev/null
+++ b/test/files/neg/t8610-arg.flags
@@ -0,0 +1 @@
+-Xfatal-warnings -Xlint warn-nullary-unit
diff --git a/test/files/neg/t8610-arg.scala b/test/files/neg/t8610-arg.scala
new file mode 100644
index 0000000000..494a3354da
--- /dev/null
+++ b/test/files/neg/t8610-arg.scala
@@ -0,0 +1,7 @@
+
+case class X(name: String) {
+  def x = "Hi, $name"   // missing interp
+  def f(p: (Int, Int)): Int = p._1 * p._2
+  def g = f(3, 4)       // adapted
+  def u: Unit = ()      // unitarian universalist
+}
diff --git a/test/files/neg/t8610.check b/test/files/neg/t8610.check
new file mode 100644
index 0000000000..7a18e55127
--- /dev/null
+++ b/test/files/neg/t8610.check
@@ -0,0 +1,15 @@
+t8610.scala:3: warning: `$name` looks like an interpolated identifier! Did you forget the interpolator?
+  def x = "Hi, $name"   // missing interp
+          ^
+t8610.scala:5: 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:6: 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/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..494a3354da
--- /dev/null
+++ b/test/files/neg/t8610.scala
@@ -0,0 +1,7 @@
+
+case class X(name: String) {
+  def x = "Hi, $name"   // missing interp
+  def f(p: (Int, Int)): Int = p._1 * p._2
+  def g = f(3, 4)       // adapted
+  def u: Unit = ()      // unitarian universalist
+}
diff --git a/test/files/run/t8610.check b/test/files/run/t8610.check
new file mode 100644
index 0000000000..077382fb1c
--- /dev/null
+++ b/test/files/run/t8610.check
@@ -0,0 +1,10 @@
+t8610.scala:4: warning: `$name` looks like an interpolated identifier! Did you forget the interpolator?
+  def x = "Hi, $name"   // missing interp
+          ^
+t8610.scala:6: 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
+           ^
+Hi, $name
diff --git a/test/files/run/t8610.flags b/test/files/run/t8610.flags
new file mode 100644
index 0000000000..edcb5f4d0c
--- /dev/null
+++ b/test/files/run/t8610.flags
@@ -0,0 +1 @@
+-Xlint:warn-adapted-args
diff --git a/test/files/run/t8610.scala b/test/files/run/t8610.scala
new file mode 100644
index 0000000000..dd9e8e861e
--- /dev/null
+++ b/test/files/run/t8610.scala
@@ -0,0 +1,13 @@
+
+// flags don't warn on u
+case class X(name: String) {
+  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
+}
+
+object Test extends App {
+  // poignant demonstration
+  Console println X("Bob").x
+}