Patch x: _* into x* (not x *)

Author: nicolasstucki

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -2344,7 +2344,7 @@ object Parsers {
               in.sourcePos(uscoreStart),
               future)
             if sourceVersion == `future-migration` then
-              patch(source, Span(t.span.end, in.lastOffset), " *")
+              patch(source, Span(t.span.end, in.lastOffset), "*")
           else if opStack.nonEmpty then
             report.errorOrMigrationWarning(
               em"""`_*` can be used only for last argument of method application.