diff options
Diffstat (limited to 'testsuite/tests/typecheck/should_fail/T20666a.stderr')
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T20666a.stderr | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_fail/T20666a.stderr b/testsuite/tests/typecheck/should_fail/T20666a.stderr new file mode 100644 index 0000000000..4192b88807 --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/T20666a.stderr @@ -0,0 +1,10 @@ + +T20666a.hs:11:10: error: [GHC-39999] + • Could not deduce ‘Eq (F [a])’ + arising from the superclasses of an instance declaration + from the context: D [a] + bound by the instance declaration at T20666a.hs:11:10-23 + Possible fix: + If the constraint looks soluble from a superclass of the instance context, + read 'Undecidable instances and loopy superclasses' in the user manual + • In the instance declaration for ‘C [a]’ |