From 9888e2e32bff91e072da1dfb3c6cd7d8f397a508 Mon Sep 17 00:00:00 2001
From: Nicolas Stucki <nicolas.stucki@gmail.com>
Date: Wed, 1 Nov 2023 13:51:30 +0100
Subject: [PATCH] Patch `x: _*` into `x*` (not `x *`)

---
 compiler/src/dotty/tools/dotc/parsing/Parsers.scala |  2 +-
 tests/rewrites/rewrites3x.check                     | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 tests/rewrites/rewrites3x.check

diff --git a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala b/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
index 48653ad96197..6f33376e1e48 100644
--- a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
+++ b/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.
diff --git a/tests/rewrites/rewrites3x.check b/tests/rewrites/rewrites3x.check
new file mode 100644
index 000000000000..0e7e0193bdd3
--- /dev/null
+++ b/tests/rewrites/rewrites3x.check
@@ -0,0 +1,10 @@
+import scala.{collection as coll, runtime as _, *}
+import coll.*
+
+def f(xs: Int*) = xs.sum
+def test =
+  f(List(1, 2, 3)*)
+
+def g = { implicit (x: Int) =>
+  x + 1
+}