blob: da91273ff023edca9da83faf342b5869a3deaa64 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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
|
