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-rw-r--r--testsuite/tests/driver/all.T3
1 files changed, 3 insertions, 0 deletions
diff --git a/testsuite/tests/driver/all.T b/testsuite/tests/driver/all.T
index 0e6eb594b1..f9174a6015 100644
--- a/testsuite/tests/driver/all.T
+++ b/testsuite/tests/driver/all.T
@@ -294,3 +294,6 @@ test('OneShotTH', normal, makefile_test, [])
test('T17481', normal, makefile_test, [])
test('T20084', normal, makefile_test, [])
test('RunMode', extra_files(['RunMode/Test.hs']), run_command, ['{compiler} --run -iRunMode/ -ignore-dot-ghci RunMode.hs -- hello'])
+test('T20439', normal, run_command,
+ ['echo "module Foo where" >> Foo.hs && \
+ {compiler} -E -fno-code -XCPP -v Foo.hs 2>&1 | grep "Copying" | sed "s/.*to//" '])