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| author | Kari Pahula <kaol@iki.fi> | 2019-09-24 16:33:15 +0300 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2019-09-25 13:52:48 -0400 |
| commit | 2970dc7ab95f7daa793112c6a4a682263561761c (patch) | |
| tree | bcbc7c565479441427e5e512b6c71d85ce6d497e /testsuite/tests/deriving | |
| parent | 218c5dbfbd60a416588e1b952c167ebd18ef9c56 (diff) | |
| download | haskell-2970dc7ab95f7daa793112c6a4a682263561761c.tar.gz | |
Add -Wderiving-defaults (#15839)
Enabling both DeriveAnyClass and GeneralizedNewtypeDeriving can cause
a warning when no explicit deriving strategy is in use. This change adds
an enable/suppress flag for it.
Diffstat (limited to 'testsuite/tests/deriving')
| -rw-r--r-- | testsuite/tests/deriving/should_compile/T16179.stderr | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/testsuite/tests/deriving/should_compile/T16179.stderr b/testsuite/tests/deriving/should_compile/T16179.stderr index c3815d138f..ae40e85a0e 100644 --- a/testsuite/tests/deriving/should_compile/T16179.stderr +++ b/testsuite/tests/deriving/should_compile/T16179.stderr @@ -1,5 +1,6 @@ -T16179.hs:7:30: warning: - Both DeriveAnyClass and GeneralizedNewtypeDeriving are enabled + +T16179.hs:7:30: warning: [-Wderiving-defaults (in -Wdefault)] + • Both DeriveAnyClass and GeneralizedNewtypeDeriving are enabled Defaulting to the DeriveAnyClass strategy for instantiating C Use DerivingStrategies to pick a different strategy - In the newtype declaration for ‘T’ + • In the newtype declaration for ‘T’ |