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stoogle

https://www.stackage.org/lts/hoogle?q=%s
Stackage Hoogle Search for Haskell (latest LTS)

The Stackage Hoogle search indexes more than the normal Hoogle site.

You can query for functions just by type signature (not knowing names).
Example: stoogle a -> a

Of course, you can search for functions by names/symbols too:
Example: stoogle >>=
    
304 uses - Created 2015-12-28 21:51:55 - Last used 2021-01-24 23:56:25
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