diff --git a/sbt-app/src/sbt-test/actions/aggregate/changes/build.sbt b/sbt-app/src/sbt-test/actions/aggregate/changes/build.sbt
index 53601ea4a..39bd4c2bd 100644
--- a/sbt-app/src/sbt-test/actions/aggregate/changes/build.sbt
+++ b/sbt-app/src/sbt-test/actions/aggregate/changes/build.sbt
@@ -1,5 +1,5 @@
 lazy val root = (project in file("."))
-  .aggregate((if(file("aggregate").exists) Seq(sub: sbt.ProjectReference) else Nil): _*)
+  .aggregate((if(file("aggregate").exists) Seq(sub: sbt.ProjectReference) else Nil)*)
 
 lazy val sub = (project in file("sub"))
   .aggregate(sub2)
diff --git a/sbt-app/src/sbt-test/actions/configuration-delegation/build.sbt b/sbt-app/src/sbt-test/actions/configuration-delegation/build.sbt
index 9cd20a168..b93d6ca15 100644
--- a/sbt-app/src/sbt-test/actions/configuration-delegation/build.sbt
+++ b/sbt-app/src/sbt-test/actions/configuration-delegation/build.sbt
@@ -9,7 +9,7 @@ lazy val PerformanceTest = (config("pt") extend Test)
 
 lazy val root = (project in file("."))
   .configs(PerformanceTest)
-  .settings(Seq(Compile, Test, Runtime, PerformanceTest).map(makeFoo) :_*)
+  .settings(Seq(Compile, Test, Runtime, PerformanceTest).map(makeFoo)*)
   .settings(
      PerformanceTest / bar := IO.write(file("pt-bar"), "bar")
   )
diff --git a/sbt-app/src/sbt-test/dependency-management/circular-dependency/changes/multi.sbt b/sbt-app/src/sbt-test/dependency-management/circular-dependency/changes/multi.sbt
index 9179a8e41..f916be875 100644
--- a/sbt-app/src/sbt-test/dependency-management/circular-dependency/changes/multi.sbt
+++ b/sbt-app/src/sbt-test/dependency-management/circular-dependency/changes/multi.sbt
@@ -14,7 +14,7 @@ def commonSettings: Seq[Def.Setting[?]] =
   )
 
 lazy val a = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     name := "a",
     libraryDependencies := Seq(
@@ -24,7 +24,7 @@ lazy val a = project.
   )
 
 lazy val b = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     name := "b",
     // this adds circular dependency
@@ -32,14 +32,14 @@ lazy val b = project.
   )
 
 lazy val c = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     name := "c",
     libraryDependencies := Seq(organization.value %% "b" % version.value)
   )
 
 lazy val root = (project in file(".")).
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     (ThisBuild / organization) := "org.example",
     (ThisBuild / version) := "1.0-SNAPSHOT"
diff --git a/sbt-app/src/sbt-test/dependency-management/circular-dependency/multi.sbt b/sbt-app/src/sbt-test/dependency-management/circular-dependency/multi.sbt
index 62ed3af48..4eb09c87d 100644
--- a/sbt-app/src/sbt-test/dependency-management/circular-dependency/multi.sbt
+++ b/sbt-app/src/sbt-test/dependency-management/circular-dependency/multi.sbt
@@ -13,7 +13,7 @@ def commonSettings: Seq[Def.Setting[?]] =
   )
 
 lazy val a = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     name := "a",
     libraryDependencies := Seq(
@@ -22,20 +22,20 @@ lazy val a = project.
   )
 
 lazy val b = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     name := "b"
   )
 
 lazy val c = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     name := "c",
     libraryDependencies := Seq(organization.value %% "b" % version.value)
   )
 
 lazy val root = (project in file(".")).
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     ThisBuild / organization := "org.example",
     ThisBuild / version := "1.0-SNAPSHOT",
diff --git a/sbt-app/src/sbt-test/dependency-management/deliver-artifacts/build.sbt b/sbt-app/src/sbt-test/dependency-management/deliver-artifacts/build.sbt
index ed8a554ac..8d6fca01b 100644
--- a/sbt-app/src/sbt-test/dependency-management/deliver-artifacts/build.sbt
+++ b/sbt-app/src/sbt-test/dependency-management/deliver-artifacts/build.sbt
@@ -2,7 +2,7 @@ ThisBuild / csrCacheDirectory := (ThisBuild / baseDirectory).value / "coursier-c
 ThisBuild / organization := "org.example"
 ThisBuild / version := "1.0"
 
-lazy val a = project.settings(common: _*).settings(
+lazy val a = project.settings(common).settings(
   // verifies that a can be published as an ivy.xml file and preserve the extra artifact information,
   //   such as a classifier
   libraryDependencies := Seq(("net.sf.json-lib" % "json-lib" % "2.4").classifier("jdk15").intransitive()),
@@ -10,7 +10,7 @@ lazy val a = project.settings(common: _*).settings(
   (Compile / packageBin / artifact) := Artifact("demo")
 )
 
-lazy val b = project.settings(common: _*).settings(
+lazy val b = project.settings(common).settings(
   libraryDependencies := Seq(organization.value %% "a" % version.value)
 )
 
diff --git a/sbt-app/src/sbt-test/dependency-management/gh-1484-npe/build.sbt b/sbt-app/src/sbt-test/dependency-management/gh-1484-npe/build.sbt
index dd5731609..8cb6d6c6a 100644
--- a/sbt-app/src/sbt-test/dependency-management/gh-1484-npe/build.sbt
+++ b/sbt-app/src/sbt-test/dependency-management/gh-1484-npe/build.sbt
@@ -11,7 +11,7 @@ def commonSettings: Seq[Def.Setting[?]] = Seq(
   )
 
 lazy val projA = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.2"),
     addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager"  % "0.7.3")
diff --git a/sbt-app/src/sbt-test/dependency-management/mvn-local/build.sbt b/sbt-app/src/sbt-test/dependency-management/mvn-local/build.sbt
index fea60fb80..c8387f69e 100644
--- a/sbt-app/src/sbt-test/dependency-management/mvn-local/build.sbt
+++ b/sbt-app/src/sbt-test/dependency-management/mvn-local/build.sbt
@@ -11,7 +11,7 @@ def commonSettings: Seq[Def.Setting[?]] =
   )
 
 lazy val main = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     uniqueName,
     libraryDependencies += (projectID in library).value,
@@ -21,7 +21,7 @@ lazy val main = project.
   )
 
 lazy val library = project.
-  settings(commonSettings: _*).
+  settings(commonSettings).
   settings(
     uniqueName
   )
diff --git a/sbt-app/src/sbt-test/project-matrix/finder/build.sbt b/sbt-app/src/sbt-test/project-matrix/finder/build.sbt
index a4e8632c2..cb05b2b5f 100644
--- a/sbt-app/src/sbt-test/project-matrix/finder/build.sbt
+++ b/sbt-app/src/sbt-test/project-matrix/finder/build.sbt
@@ -7,7 +7,7 @@ lazy val config12 = ConfigAxis("Config1_2", "config1.2")
 lazy val config13 = ConfigAxis("Config1_3", "config1.3")
 
 lazy val root = (project in file("."))
-  .aggregate((core.projectRefs ++ custom.projectRefs):_*)
+  .aggregate((core.projectRefs ++ custom.projectRefs)*)
 
 lazy val core = (projectMatrix in file("core"))
   .jvmPlatform(scalaVersions = Seq(scala213, scala212))
diff --git a/sbt-app/src/sbt-test/project-matrix/jvm-with-scoping/build.sbt b/sbt-app/src/sbt-test/project-matrix/jvm-with-scoping/build.sbt
index 7638c6114..2b7572232 100644
--- a/sbt-app/src/sbt-test/project-matrix/jvm-with-scoping/build.sbt
+++ b/sbt-app/src/sbt-test/project-matrix/jvm-with-scoping/build.sbt
@@ -3,7 +3,7 @@ lazy val scala212 = "2.12.21"
 lazy val check = taskKey[Unit]("")
 
 lazy val root = (project in file("."))
-  .aggregate(core.projectRefs ++ app.projectRefs: _*)
+  .aggregate((core.projectRefs ++ app.projectRefs)*)
   .settings(
   )
 
diff --git a/sbt-app/src/sbt-test/project-matrix/jvm/build.sbt b/sbt-app/src/sbt-test/project-matrix/jvm/build.sbt
index 4e1746b0c..1c422e7a3 100644
--- a/sbt-app/src/sbt-test/project-matrix/jvm/build.sbt
+++ b/sbt-app/src/sbt-test/project-matrix/jvm/build.sbt
@@ -3,7 +3,7 @@ lazy val scala3 = "3.4.2"
 lazy val check = taskKey[Unit]("")
 
 lazy val root = (project in file("."))
-  .aggregate(core.projectRefs ++ app.projectRefs: _*)
+  .aggregate((core.projectRefs ++ app.projectRefs)*)
   .settings(
   )
 
diff --git a/sbt-app/src/sbt-test/project-matrix/projectAxes/build.sbt b/sbt-app/src/sbt-test/project-matrix/projectAxes/build.sbt
index 956fc9c2f..298b760bb 100644
--- a/sbt-app/src/sbt-test/project-matrix/projectAxes/build.sbt
+++ b/sbt-app/src/sbt-test/project-matrix/projectAxes/build.sbt
@@ -9,7 +9,7 @@ lazy val config12 = ConfigAxis("Config1_2", "config1.2")
 lazy val config13 = ConfigAxis("Config1_3", "config1.3")
 
 lazy val root = (project in file("."))
-  .aggregate((core.projectRefs ++ custom.projectRefs):_*)
+  .aggregate((core.projectRefs ++ custom.projectRefs)*)
 
 lazy val core = (projectMatrix in file("core"))
   .settings(
diff --git a/sbt-app/src/sbt-test/project/circular/build.sbt b/sbt-app/src/sbt-test/project/circular/build.sbt
index da3f9877c..698ea5872 100644
--- a/sbt-app/src/sbt-test/project/circular/build.sbt
+++ b/sbt-app/src/sbt-test/project/circular/build.sbt
@@ -15,4 +15,4 @@ lazy val foo: Project = project.
   dependsOn(LocalProject("root")).
   settings(List(
     name := (LocalProject("root") / name).value + "foo"
-  ): _*)
+  )*)
diff --git a/sbt-app/src/sbt-test/tests/bak/build.sbt b/sbt-app/src/sbt-test/tests/bak/build.sbt
index b92d11dea..4d7d7d37c 100644
--- a/sbt-app/src/sbt-test/tests/bak/build.sbt
+++ b/sbt-app/src/sbt-test/tests/bak/build.sbt
@@ -23,7 +23,7 @@ val CustomConfigs = List(Config_0, Config_1, Config_2, Config_3, Config_4, Confi
 
 val t = taskKey[Unit]("")
 val p1 = project
-  .configs(CustomConfigs: _*)
+  .configs(CustomConfigs*)
   .settings(
     t := Def.uncached {
         (Config_0 / compile).value