«= ~» поднять «Нет экземпляра для (RegexContext Regex [Char] [String])»

ОС: MacOSX 10.7.1 GHC и Haskell-platform от brew.

   GHCi, version 7.0.4: http://www.haskell.org/ghc/  :? for help
    Loading package ghc-prim ... linking ... done.
    Loading package integer-gmp ... linking ... done.
    Loading package base ... linking ... done.
    Loading package ffi-1.0 ... linking ... done.
    Prelude> :m +Text.Regex.Posix
    Prelude Text.Regex.Posix> "foo" =~ "o" :: [String]

    <interactive>:1:7:
        No instance for (RegexContext Regex [Char] [String])
          arising from a use of `=~'
        Possible fix:
          add an instance declaration for
          (RegexContext Regex [Char] [String])
        In the expression: "foo" =~ "o" :: [String]
        In an equation for `it': it = "foo" =~ "o" :: [String]
    Prelude Text.Regex.Posix> "foo" =~ "o" :: String
    Loading package array-0.3.0.2 ... linking ... done.
    Loading package bytestring-0.9.1.10 ... linking ... done.
    Loading package containers-0.4.0.0 ... linking ... done.
    Loading package transformers-0.2.2.0 ... linking ... done.
    Loading package mtl-2.0.1.0 ... linking ... done.
    Loading package regex-base-0.93.2 ... linking ... done.
    Loading package regex-posix-0.95.1 ... linking ... done.
    "o"

Я считаю, что библиотеки обновлены. И я думаю, что результат "foo" = ~ "o" :: [String] будет ["o", "o"]

Любое предложение будет оценено.