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Diffstat (limited to 'docs/users_guide/separate_compilation.rst')
| -rw-r--r-- | docs/users_guide/separate_compilation.rst | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/docs/users_guide/separate_compilation.rst b/docs/users_guide/separate_compilation.rst index c6e9b7d0b6..b580c9ab18 100644 --- a/docs/users_guide/separate_compilation.rst +++ b/docs/users_guide/separate_compilation.rst @@ -864,10 +864,12 @@ A hs-boot file is written in a subset of Haskell: You cannot use ``deriving`` on a data type declaration; write an ``instance`` declaration instead. -- Class declarations is exactly as in Haskell, except that you may not - put default method declarations. You can also omit all the - superclasses and class methods entirely; but you must either omit - them all or put them all in. +- Class declarations can either be given in full, exactly as in Haskell, + or they can be given abstractly by omitting everything other than the + instance head: no superclasses, no class methods, no associated types. + If the class declaration is given in full, the default delarations + must also match; this applies to both default methods and default + declarations for associated types. - You can include instance declarations just as in Haskell; but omit the "where" part. |