#3665: Add whole-package deprecation warnings
-----------------------------+----------------------------------------------
Reporter: duncan | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 6.12.1 RC1 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
-----------------------------+----------------------------------------------
With GHC-6.12 if you use base 3 you get:
{{{
Warning: Module `Prelude' is deprecated:
[You are using an old version of base. Future
GHC versions will not support this version, so you need to
update your code to use the new base version.]
}}}
This is initially a somewhat confusing warning. We're not really
deprecating the Prelude!
It would be much nicer if it told us:
{{{
Warning: Package `base-3.0.3.2' is deprecated:
[You are using an old version of base. Future
GHC versions will not support this version, so you need to
update your code to use the new base version.]
}}}
The message itself could be formatted more nicely too. Patch attached for
that.
Note the current spurious list syntax in the deprecation message. I've re-
opened #3303 about that.
As for the syntax for package deprecations, how about just
{{{
module Foo {-# DEPRECATED package "the message" #-} (..) where
}}}
For the behaviour, how about making them behave just like module-
deprecation messages in that one attaches them to a module header and they
are only triggered if you import that module. The only change would be in
how the message is reported; instead of saying the module is deprecated
it'd give the package (including the full version).
I know this is a feature request, which usually we'd want to put off for
the next major version, but since this one is all about helping
maintainers and users of 6.12.1 and .2, I hope that we consider looking at
it for an early 6.12 release.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3665>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
