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Diffstat (limited to 'docs/users_guide/using-warnings.rst')
| -rw-r--r-- | docs/users_guide/using-warnings.rst | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/docs/users_guide/using-warnings.rst b/docs/users_guide/using-warnings.rst index c6a86bbb71..cf41c283ab 100644 --- a/docs/users_guide/using-warnings.rst +++ b/docs/users_guide/using-warnings.rst @@ -74,6 +74,7 @@ The following flags are simple ways to select standard "packages" of warnings: * :ghc-flag:`-Wimplicit-prelude` * :ghc-flag:`-Wmissing-local-signatures` * :ghc-flag:`-Wmissing-exported-signatures` + * :ghc-flag:`-Wmissing-export-lists` * :ghc-flag:`-Wmissing-import-lists` * :ghc-flag:`-Wmissing-home-modules` * :ghc-flag:`-Widentities` @@ -858,6 +859,31 @@ of ``-W(no-)*``. fields are initialised with bottoms), it is often an indication of a programmer error. +.. ghc-flag:: -Wmissing-export-lists + :shortdesc: warn when a module declaration does not explicitly list all + exports + :type: dynamic + :reverse: -fnowarn-missing-export-lists + :category: + + :since: 8.4.1 + + .. index:: + single: missing export lists, warning + single: export lists, missing + + This flag warns if you declare a module without declaring an explicit + export list. For example :: + + module M where + + p x = x + + The :ghc-flag:`-Wmissing-export-lists` flag will warn that ``M`` does not + declare an export list. Declaring an explicit export list for ``M`` enables + GHC dead code analysis, prevents accidental export of names and can ease + optimizations like inlining. + .. ghc-flag:: -Wmissing-import-lists :shortdesc: warn when an import declaration does not explicitly list all the names brought into scope |