isInfixOf package:Cabal-syntax

The isInfixOf function takes two lists and returns True iff the first list is contained, wholly and intact, anywhere within the second.

>>> isInfixOf "Haskell" "I really like Haskell."
True

>>> isInfixOf "Ial" "I really like Haskell."
False

For the result to be True, the first list must be finite; for the result to be False, the second list must be finite:

>>> [20..50] `isInfixOf` [0..]
True

>>> [0..] `isInfixOf` [20..50]
False

>>> [0..] `isInfixOf` [0..]
* Hangs forever *