implicit call stacks should provide a way to get the calling function's name

With implicit call stacks we can get the calling SrcPos and the called function's name, but not the caller function's name. E.g.:

{-# LANGUAGE ImplicitParams, ConstraintKinds #-}
import qualified GHC.Stack as Stack

caller :: IO ()
caller = callee 10
    where
    callee :: (?stack :: Stack.CallStack) => Int -> IO ()
    callee _n = mapM_ print (Stack.getCallStack ?stack)

Gives

("?stack",SrcLoc {srcLocPackage = "main", srcLocModule = "Main", srcLocFile = "T.hs", srcLocStartLine = 9, srcLocStartCol = 36, srcLocEndLine = 9, srcLocEndCol = 42})
("callee",SrcLoc {srcLocPackage = "main", srcLocModule = "Main", srcLocFile = "T.hs", srcLocStartLine = 6, srcLocStartCol = 23, srcLocEndLine = 6, srcLocEndCol = 29})

It would be nice to get the name "caller" as well. It's too bad getCallStack returns pairs instead of an abstract type like Frame. Perhaps a separate Stack.getFrames could do that while getCallStack continues to return pairs for compatibility.

Trac metadata

Trac field	Value
Version	7.10.3
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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