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Diffstat (limited to 'docs/users_guide/using-warnings.rst')
| -rw-r--r-- | docs/users_guide/using-warnings.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/docs/users_guide/using-warnings.rst b/docs/users_guide/using-warnings.rst index 4cae76ec5a..8cdd5677fe 100644 --- a/docs/users_guide/using-warnings.rst +++ b/docs/users_guide/using-warnings.rst @@ -55,6 +55,7 @@ To reverse ``-Werror``, which makes all warnings into errors, use ``-Wwarn``. * :ghc-flag:`-Wstar-binder` * :ghc-flag:`-Woperator-whitespace-ext-conflict` * :ghc-flag:`-Wambiguous-fields` + * :ghc-flag:`-Wunicode-bidirectional-format-characters` The following flags are simple ways to select standard "packages" of warnings: @@ -2169,6 +2170,23 @@ of ``-W(no-)*``. This warning has no effect when :extension:`DuplicateRecordFields` is disabled. +.. ghc-flag:: -Wunicode-bidirectional-format-characters + :shortdesc: warn about the usage of unicode bidirectional layout override characters + :type: dynamic + :category: + + Explicit unicode bidirectional formatting characters can cause source code + to be rendered misleadingly in many viewers. We warn if any such character + is present in the source. + + Specifically, the characters disallowed by this warning + are those which are a part of the 'Explicit Formatting` + category of the `Unicode Bidirectional Character Type Listing + <https://www.unicode.org/reports/tr9/#Bidirectional_Character_Types>`_ + + :since: 9.0.2 + + 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.) |