Peculiar anomaly with record style data types and deriving Read

[DinoMorelli]

-- Given this data type

data Foo = Foo { foo :: Int } deriving (Read, Show)

-- this fails

bar :: Foo

bar = read "Foo 42"

-- However, non-record-style construction is allowed:

baz :: Foo

baz = Foo 42

[igloo]

Thanks for the report; however, this is not a bug.

The  Haskell Report, section 10.4 says

If the constructor is defined using record syntax, the derived Read
will parse only the record-syntax form, and furthermore, the fields
must be given in the same order as the original declaration.