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| author | Herbert Valerio Riedel <hvr@gnu.org> | 2014-12-19 11:08:09 +0100 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2014-12-19 13:12:50 +0100 |
| commit | 5b8fa46ca37caa9ec83b217a697628135da34506 (patch) | |
| tree | 88c045a6c084f3958a670a27bf47724251fabc1f /testsuite/tests/overloadedlists | |
| parent | cf594fd204f951f849e876cf28f6ac1604184ae7 (diff) | |
| download | haskell-5b8fa46ca37caa9ec83b217a697628135da34506.tar.gz | |
Add Data.Version.makeVersion & `IsList Version`
These two facilities provide some means to avoid the double-breakage caused by
first by the deprecation (see #2496), and then again by the actual future
field-removal.
See also
https://groups.google.com/d/msg/haskell-core-libraries/q9H-QlL_gnE/4lbb_mBjre8J
for details about this library addition.
Reviewed By: ekmett
Differential Revision: https://phabricator.haskell.org/D577
Diffstat (limited to 'testsuite/tests/overloadedlists')
| -rw-r--r-- | testsuite/tests/overloadedlists/should_fail/overloadedlistsfail01.stderr | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/testsuite/tests/overloadedlists/should_fail/overloadedlistsfail01.stderr b/testsuite/tests/overloadedlists/should_fail/overloadedlistsfail01.stderr index 9f3a8325c2..6516beb078 100644 --- a/testsuite/tests/overloadedlists/should_fail/overloadedlistsfail01.stderr +++ b/testsuite/tests/overloadedlists/should_fail/overloadedlistsfail01.stderr @@ -3,10 +3,11 @@ overloadedlistsfail01.hs:5:8: No instance for (Show a0) arising from a use of ‘print’ The type variable ‘a0’ is ambiguous Note: there are several potential instances: + instance [safe] Show Data.Version.Version + -- Defined in ‘Data.Version’ instance Show a => Show (Maybe a) -- Defined in ‘GHC.Show’ instance Show Ordering -- Defined in ‘GHC.Show’ - instance Show Integer -- Defined in ‘GHC.Show’ - ...plus 22 others + ...plus 23 others In the expression: print [1] In an equation for ‘main’: main = print [1] @@ -14,7 +15,9 @@ overloadedlistsfail01.hs:5:14: No instance for (GHC.Exts.IsList a0) arising from an overloaded list The type variable ‘a0’ is ambiguous - Note: there is a potential instance available: + Note: there are several potential instances: + instance GHC.Exts.IsList Data.Version.Version + -- Defined in ‘GHC.Exts’ instance GHC.Exts.IsList [a] -- Defined in ‘GHC.Exts’ In the first argument of ‘print’, namely ‘[1]’ In the expression: print [1] |