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| author | Simon Peyton Jones <simon.peytonjones@gmail.com> | 2022-12-19 22:58:07 +0000 |
|---|---|---|
| committer | Zubin Duggal <zubin.duggal@gmail.com> | 2023-02-07 18:47:09 +0530 |
| commit | c63a3e25e9265851beefef99a30cbfe29136a254 (patch) | |
| tree | a0ca210221386cb699a63cf4d6f2fb92cebce801 | |
| parent | 27f154f9c68b2c64107eb64104d9eb92295191c6 (diff) | |
| download | haskell-c63a3e25e9265851beefef99a30cbfe29136a254.tar.gz | |
Fix an assertion check in addToEqualCtList
The old assertion saw that a constraint ct could rewrite itself
(of course it can) and complained (stupid).
Fixes #22645
(cherry picked from commit 3d55d8ab51ece43c51055c43c9e7aba77cce46c0)
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T22645.hs | 9 | ||||
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T22645.stderr | 15 | ||||
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/all.T | 1 |
3 files changed, 25 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_fail/T22645.hs b/testsuite/tests/typecheck/should_fail/T22645.hs new file mode 100644 index 0000000000..ee5f03d180 --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/T22645.hs @@ -0,0 +1,9 @@ +module T22645 where + +import Data.Coerce + +type T :: (* -> *) -> * -> * +data T m a = MkT (m a) + +p :: Coercible a b => T Maybe a -> T Maybe b +p = coerce diff --git a/testsuite/tests/typecheck/should_fail/T22645.stderr b/testsuite/tests/typecheck/should_fail/T22645.stderr new file mode 100644 index 0000000000..5844a67dce --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/T22645.stderr @@ -0,0 +1,15 @@ + +T22645.hs:9:5: error: + • Couldn't match type ‘a’ with ‘b’ arising from a use of ‘coerce’ + ‘a’ is a rigid type variable bound by + the type signature for: + p :: forall a b. Coercible a b => T Maybe a -> T Maybe b + at T22645.hs:8:1-44 + ‘b’ is a rigid type variable bound by + the type signature for: + p :: forall a b. Coercible a b => T Maybe a -> T Maybe b + at T22645.hs:8:1-44 + • In the expression: coerce + In an equation for ‘p’: p = coerce + • Relevant bindings include + p :: T Maybe a -> T Maybe b (bound at T22645.hs:9:1) diff --git a/testsuite/tests/typecheck/should_fail/all.T b/testsuite/tests/typecheck/should_fail/all.T index 358999c612..04fb804d33 100644 --- a/testsuite/tests/typecheck/should_fail/all.T +++ b/testsuite/tests/typecheck/should_fail/all.T @@ -629,3 +629,4 @@ test('T19397E4', extra_files(['T19397S.hs']), multimod_compile_fail, test('T20043', normal, compile_fail, ['']) test('T20260', normal, compile_fail, ['']) test('T21130', normal, compile_fail, ['']) +test('T22645', normal, compile_fail, ['']) |