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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc130.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/tc130.hs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc130.hs b/testsuite/tests/typecheck/should_compile/tc130.hs new file mode 100644 index 0000000000..da91273ff0 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc130.hs @@ -0,0 +1,16 @@ +{-# LANGUAGE ImplicitParams #-} + +-- !!! Desugaring of record updates +-- Showed up a bug in the newtype-squashing machinery + + +module ShouldCompile where + +data R = R {field :: Int} + +test:: (?param :: R) => a -> Int +test x = field (?param {field = 42}) + -- The type of the record to be updated is + -- {?param :: R} as well as plain R + -- which confused the compiler + |