fix error in test

tests/neg/i11118-pre3-4.check

@@ -0,0 +1,12 @@
+-- Warning: tests/neg/i11118-pre3-4.scala:4:12 -------------------------------------------------------------------------
+4 |val (a,b) = (1,2,3) // error // warning
+  |            ^^^^^^^
+  |          pattern's type (Any, Any) does not match the right hand side expression's type (Int, Int, Int)
+  |
+  |          If the narrowing is intentional, this can be communicated by adding `: @unchecked` after the expression,
+  |          which may result in a MatchError at runtime.
+  |          This patch can be rewritten automatically under -rewrite -source 3.2-migration.
+-- Error: tests/neg/i11118-pre3-4.scala:4:4 ----------------------------------------------------------------------------
+4 |val (a,b) = (1,2,3) // error // warning
+  |    ^
+  |    this case is unreachable since type (Int, Int, Int) is not a subclass of class Tuple2

tests/neg/i11118-pre3-4.scala

@@ -0,0 +1,4 @@
+import scala.language.`3.3`
+
+// https://github.com/lampepfl/dotty/issues/11118
+val (a,b) = (1,2,3) // error // warning

tests/neg/i11118.check

@@ -1,12 +1,8 @@
--- Warning: tests/neg/i11118.scala:2:12 --------------------------------------------------------------------------------
-2 |val (a,b) = (1,2,3) // error // warning
+-- Error: tests/neg/i11118.scala:2:12 ----------------------------------------------------------------------------------
+2 |val (a,b) = (1,2,3) // error
   |            ^^^^^^^
   |          pattern's type (Any, Any) does not match the right hand side expression's type (Int, Int, Int)
   |
   |          If the narrowing is intentional, this can be communicated by adding `: @unchecked` after the expression,
   |          which may result in a MatchError at runtime.
   |          This patch can be rewritten automatically under -rewrite -source 3.2-migration.
--- Error: tests/neg/i11118.scala:2:4 -----------------------------------------------------------------------------------
-2 |val (a,b) = (1,2,3) // error // warning
-  |    ^
-  |    this case is unreachable since type (Int, Int, Int) is not a subclass of class Tuple2

tests/neg/i11118.scala

@@ -1,2 +1,2 @@
 // https://github.com/lampepfl/dotty/issues/11118
-val (a,b) = (1,2,3) // error // warning
+val (a,b) = (1,2,3) // error