diff options
| -rw-r--r-- | compiler/parser/RdrHsSyn.hs | 13 | ||||
| -rw-r--r-- | testsuite/tests/parser/should_fail/T14740.hs | 6 | ||||
| -rw-r--r-- | testsuite/tests/parser/should_fail/T14740.stderr | 4 | ||||
| -rw-r--r-- | testsuite/tests/parser/should_fail/all.T | 1 |
4 files changed, 23 insertions, 1 deletions
diff --git a/compiler/parser/RdrHsSyn.hs b/compiler/parser/RdrHsSyn.hs index fcb1fede20..357d22438a 100644 --- a/compiler/parser/RdrHsSyn.hs +++ b/compiler/parser/RdrHsSyn.hs @@ -849,11 +849,22 @@ checkBlockArguments expr = case unLoc expr of $$ text "You could write it with parentheses" $$ text "Or perhaps you meant to enable BlockArguments?" +-- | Validate the context constraints and break up a context into a list +-- of predicates. +-- +-- @ +-- (Eq a, Ord b) --> [Eq a, Ord b] +-- Eq a --> [Eq a] +-- (Eq a) --> [Eq a] +-- (((Eq a))) --> [Eq a] +-- @ checkContext :: LHsType GhcPs -> P ([AddAnn],LHsContext GhcPs) checkContext (L l orig_t) = check [] (L l orig_t) where - check anns (L lp (HsTupleTy _ ts)) -- (Eq a, Ord b) shows up as a tuple type + check anns (L lp (HsTupleTy HsBoxedOrConstraintTuple ts)) + -- (Eq a, Ord b) shows up as a tuple type. Only boxed tuples can + -- be used as context constraints. = return (anns ++ mkParensApiAnn lp,L l ts) -- Ditto () -- don't let HsAppsTy get in the way diff --git a/testsuite/tests/parser/should_fail/T14740.hs b/testsuite/tests/parser/should_fail/T14740.hs new file mode 100644 index 0000000000..b56687f051 --- /dev/null +++ b/testsuite/tests/parser/should_fail/T14740.hs @@ -0,0 +1,6 @@ +{-# LANGUAGE UnboxedTuples #-} + +module T14740 where + +x :: ((##)) => () +x = () diff --git a/testsuite/tests/parser/should_fail/T14740.stderr b/testsuite/tests/parser/should_fail/T14740.stderr new file mode 100644 index 0000000000..8827873e25 --- /dev/null +++ b/testsuite/tests/parser/should_fail/T14740.stderr @@ -0,0 +1,4 @@ + +T14740.hs:5:7: + Expecting a lifted type, but ‘(# #)’ is unlifted + In the type signature: x :: ((# #)) => () diff --git a/testsuite/tests/parser/should_fail/all.T b/testsuite/tests/parser/should_fail/all.T index 6f6331ff06..ef47ed3394 100644 --- a/testsuite/tests/parser/should_fail/all.T +++ b/testsuite/tests/parser/should_fail/all.T @@ -106,6 +106,7 @@ test('T8501b', normal, compile_fail, ['']) test('T8501c', normal, compile_fail, ['']) test('T12610', normal, compile_fail, ['']) test('T14588', normal, compile_fail, ['']) +test('T14740', normal, compile_fail, ['']) test('NoNumericUnderscores0', normal, compile_fail, ['']) test('NoNumericUnderscores1', normal, compile_fail, ['']) |