SI-7299 Improve error message for eta-expanding 23+ param method

Before, we got `error: missing arguments for method f`.

2 files changed, 13 insertions, 0 deletions

diff --git a/test/files/neg/t7299.check b/test/files/neg/t7299.check
new file mode 100644
index 0000000000..74340c4841
--- /dev/null
+++ b/test/files/neg/t7299.check
@@ -0,0 +1,7 @@
+t7299.scala:4: error: implementation restricts functions to 22 parameters
+   val eta1 = f _
+              ^
+t7299.scala:5: error: implementation restricts functions to 22 parameters
+   val eta2 = g[Any] _
+               ^
+two errors found
diff --git a/test/files/neg/t7299.scala b/test/files/neg/t7299.scala
new file mode 100644
index 0000000000..f3aae5ce5d
--- /dev/null
+++ b/test/files/neg/t7299.scala
@@ -0,0 +1,6 @@
+object Test {
+   def f(a1: Int, a2: Int, a3: Int, a4: Int, a5: Int, a6: Int, a7: Int, a8: Int, a9: Int, a10: Int, a11: Int, a12: Int, a13: Int, a14: Int, a15: Int, a16: Int, a17: Int, a18: Int, a19: Int, a20: Int, a21: Int, a22: Int, a23: Int) = 0
+   def g[A](a1: Int, a2: Int, a3: Int, a4: Int, a5: Int, a6: Int, a7: Int, a8: Int, a9: Int, a10: Int, a11: Int, a12: Int, a13: Int, a14: Int, a15: Int, a16: Int, a17: Int, a18: Int, a19: Int, a20: Int, a21: Int, a22: Int, a23: Int) = 0
+   val eta1 = f _
+   val eta2 = g[Any] _
+}