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How to search for typeclass instances in Hoogle?

Is there a way to search for class instances in Hoogle (or Stackage)?

For example, I want to know which package defines the Lift instance for Text .

I managed to find it in the th-lift-instances package, but it took about 10 minutes to manually search. It seems that there must be some Hoogle functionality that allows you to search for instances.

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Not yet. However, a feature has recently been added to allow instances to reference their source, and all new documentation built on Hackage is included. Therefore, in the next release of the th-lift package, you should see the Source link next to the Lift Text instance, which will tell you what you need to know.

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Turning to Kolmar's comment , some of Google’s methods greatly advance instance search.

Examples:

-inurl: used to clear unnecessary results from where the specification was defined.

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