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diff --git a/ci/test-mill-bootstrap-1.sh b/ci/test-mill-bootstrap-1.sh
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+++ b/ci/test-mill-bootstrap-1.sh
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+#!/usr/bin/env bash
+
+set -eux
+
+# Starting from scratch...
+git clean -xdf
+
+# First build
+./mill -i all __.publishLocal launcher
+cp out/launcher/dest/mill ~/mill-1
+
+# Clean up
+git clean -xdf
+
+rm -rf ~/.mill
+
+# Differentiate first and second builds
+echo "Build 2" > info.txt && git add info.txt && git commit -m "Add info.txt"
+
+# Second build
+~/mill-1 -i all __.publishLocal launcher
+cp out/launcher/dest/mill ~/mill-2
+
+# Clean up
+git clean -xdf
+
+rm -rf ~/.mill
+
+# Use second build to run tests using Mill
+~/mill-2 -i all contrib.{twirllib,playlib,scalapblib,scoverage}.test