make core compile under -Xsource:3

context: scala/scala-dev#769

core/kind-projector.conf

@@ -1,10 +1,11 @@
-// https://github.com/typelevel/kind-projector.git#51ffa999d74dd8bc87b89a34da152e2d5ca08f3e
+// https://github.com/scalacommunitybuild/kind-projector.git#community-build-2.13  # was typelevel, 51ffa999
 
 // frozen (May 2021) just before an incompatible change:
 // https://github.com/typelevel/kind-projector/pull/186
+// forked (September 2021) to make tests compile under -Xsource:3
 
 vars.proj.kind-projector: ${vars.base} {
   name: "kind-projector"
-  uri: "https://github.com/typelevel/kind-projector.git#51ffa999d74dd8bc87b89a34da152e2d5ca08f3e"
+  uri: "https://github.com/scalacommunitybuild/kind-projector.git#93fabc53bbe43f19ef1e4e85d8e4a665a6fb3e1c"
 
 }

core/scalafix.conf

@@ -13,4 +13,11 @@ vars.proj.scalafix: ${vars.base} {
     // of the picture anymore
     "unit"
   ]
+  // even if we're running with -Xsource:3 build-wide, we don't want it in
+  // these subprojects, which contain all sorts of random Scala 2 code as tests,
+  // so can't be expected to conform to Scala 3 style
+  extra.commands: ${vars.default-commands} [
+    """set testsOutput / scalacOptions -= "-Xsource:3""""
+    """set testsInput / scalacOptions -= "-Xsource:3""""
+  ]
 }

core/scalameta.conf

@@ -1,11 +1,13 @@
-// https://github.com/scalameta/scalameta.git#v4.4.27
+// https://github.com/scalacommunitybuild/scalameta.git#community-build-2.13  # was scalameta, v4.4.27
 
 // we typically use a tag here rather than track a branch, in the
 // interest of stability.  whatever tag scalafmt and/or scalafix expect
 
+// forked (September 2021) from v4.4.27 tag to make it compile with `-Xsource:3`
+
 vars.proj.scalameta: ${vars.base} {
   name: "scalameta"
-  uri: "https://github.com/scalameta/scalameta.git#5b978a5cc6f3f185763bb1e7d2c8888e1de8a611"
+  uri: "https://github.com/scalacommunitybuild/scalameta.git#38e8fa7fdc17a83b8edd85f76359eab2e2911387"
 
   extra.projects: ["semanticdbScalacPlugin", "testkitJVM"]
   extra.commands: ${vars.default-commands} [

core/wartremover.conf

@@ -2,12 +2,17 @@
 
 vars.proj.wartremover: ${vars.base} {
   name: "wartremover"
-  uri: "https://github.com/wartremover/wartremover.git#c43465833bfb6aa150c54ec590b3da8599531c40"
+  uri: "https://github.com/wartremover/wartremover.git#72e4fe0dff3ff4021dd816d231bb69ba0a99a7f8"
 
   extra.exclude: [
     "sbt-plugin"
     "core-cross-binary"  // same artifact(s) as "core"
   ]
   deps.ignore: ["org.scala-sbt#scripted-plugin"]
   check-missing: false
+  extra.commands: ${vars.default-commands} [
+    // we exclude these test sources because they contain code that fails to compile under
+    // -Xsource:3 (which we want to be able to test in the community build)
+    """set core / Test / unmanagedSources / excludeFilter := HiddenFileFilter || "StringPlusAnyTest.scala" || "UnsafeTest.scala""""
+  ]
 }