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| author | Vladislav Zavialov <vlad.z.4096@gmail.com> | 2017-11-21 18:28:21 -0500 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2017-11-21 21:11:16 -0500 |
| commit | 0db4627b8baf3255cf16725f8acdd69e27f0ab85 (patch) | |
| tree | b2c2742ca62004001e74866a0897d03a4e8a2227 /testsuite | |
| parent | dad9864211a87bb23ae6efe0a2dd56f0eaa85601 (diff) | |
| download | haskell-0db4627b8baf3255cf16725f8acdd69e27f0ab85.tar.gz | |
Test Trac #14488
Summary:
The refactoring in 3f5673f34a2f761423027bf46f64f7499708725f also fixed a
previously unreported issue in the typechecker that prevented defining a
lens to a record field with a constraint. This patch adds a regression
test.
Test Plan: make test TEST=14488
Reviewers: bgamari
Reviewed By: bgamari
Subscribers: int-e, rwbarton, thomie
GHC Trac Issues: #14488
Differential Revision: https://phabricator.haskell.org/D4213
Diffstat (limited to 'testsuite')
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/T14488.hs | 10 | ||||
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/all.T | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/T14488.hs b/testsuite/tests/typecheck/should_compile/T14488.hs new file mode 100644 index 0000000000..a4a12841b7 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/T14488.hs @@ -0,0 +1,10 @@ +{-# LANGUAGE RankNTypes #-} + +module T14488 where + +type Lens' s a = forall f. Functor f => (a -> f a) -> s -> f s + +data T a = MkT { _tfield :: Eq a => a } + +tfield :: Eq a => Lens' (T a) a +tfield f t = MkT <$> f (_tfield t) diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T index 417e43ee70..19a99db629 100644 --- a/testsuite/tests/typecheck/should_compile/all.T +++ b/testsuite/tests/typecheck/should_compile/all.T @@ -584,3 +584,4 @@ test('T7169', normal, compile, ['']) test('T14434', [], run_command, ['$MAKE -s --no-print-directory T14434']) test('MissingExportList01', normal, compile, ['']) test('MissingExportList02', normal, compile, ['']) +test('T14488', normal, compile, ['']) |