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| author | MaxGabriel <feedback.tagher@gmail.com> | 2020-09-02 22:20:06 -0400 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2020-10-09 08:43:11 -0400 |
| commit | d360f3438da7f6eb51e217c6697db6fb338c6fd7 (patch) | |
| tree | d0870b958037e974bd199c4b1237f373c8ef3645 /docs | |
| parent | accdb24a086b80fe74776246aa33bce5a920e3c8 (diff) | |
| download | haskell-d360f3438da7f6eb51e217c6697db6fb338c6fd7.tar.gz | |
Document -Wderiving-typeable
Tracking: #18641
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/users_guide/expected-undocumented-flags.txt | 1 | ||||
| -rw-r--r-- | docs/users_guide/using-warnings.rst | 14 |
2 files changed, 14 insertions, 1 deletions
diff --git a/docs/users_guide/expected-undocumented-flags.txt b/docs/users_guide/expected-undocumented-flags.txt index 38d12ada42..5801a267bc 100644 --- a/docs/users_guide/expected-undocumented-flags.txt +++ b/docs/users_guide/expected-undocumented-flags.txt @@ -4,7 +4,6 @@ --show-packages -Onot -Walternative-layout-rule-transitional --Wderiving-typeable -XAlternativeLayoutRule -XAlternativeLayoutRuleTransitional -XAutoDeriveTypeable diff --git a/docs/users_guide/using-warnings.rst b/docs/users_guide/using-warnings.rst index 04fb591ca3..5f07299258 100644 --- a/docs/users_guide/using-warnings.rst +++ b/docs/users_guide/using-warnings.rst @@ -1881,6 +1881,20 @@ of ``-W(no-)*``. Does nothing. +.. ghc-flag:: -Wderiving-typeable + :shortdesc: warn when Typeable is derived + :type: dynamic + :reverse: -Wno-deriving-typeable + :category: + + :since: 7.10 + + This flag warns when ``Typeable`` is listed in a deriving clause + or derived with :extension:`StandaloneDeriving`. + + Since GHC 7.10, ``Typeable`` is automatically derived for all types. + Thus, deriving ``Typeable`` yourself is redundant. + If you're feeling really paranoid, the :ghc-flag:`-dcore-lint` option is a good choice. It turns on heavyweight intra-pass sanity-checking within GHC. (It checks GHC's sanity, not yours.) |