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-rw-r--r--testsuite/tests/lib/should_run/list002.hs6
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diff --git a/testsuite/tests/lib/should_run/list002.hs b/testsuite/tests/lib/should_run/list002.hs
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+++ b/testsuite/tests/lib/should_run/list002.hs
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+-- !!! Test that List.sortBy is stable.
+
+import Data.List
+
+main = print (sortBy (\(a,b) (a',b')->compare a a')
+ ([1,1,1,1,1,1,1,1,1,1]`zip`[1..10]))