Harden named arguments if a hard split occurs in the positional ones.

test/comments/expressions.stmt

Index: test/comments/expressions.stmt
diff --git a/test/comments/expressions.stmt b/test/comments/expressions.stmt
index 25920daa15a31ae144aed6230a21e001e6bc1551..2bb2b3ac6ea252e8e248eaa6ae468648d2ee34ee 100644
--- a/test/comments/expressions.stmt
+++ b/test/comments/expressions.stmt
@@ -76,4 +76,13 @@ someFunction(//
 {
   // comment
   1 + 2;
-}
+}
+>>> force named args to split on line comment in positional
+function(argument, //
+    argument, named: argument, another: argument);
+<<<
+function(
+    argument, //
+    argument,
+    named: argument,
+    another: argument);