benchmark failed to build in stackage nightly

[juhp]

       Building benchmark 'bench-rb-impl' for IntervalMap-0.6.2.3...                                                                                                 
       [1 of 9] Compiling Data.IntervalMap.Interval                                                                                                                  
       [2 of 9] Compiling Data.IntervalMap.Generic.Interval                                                                                                          
       [3 of 9] Compiling Data.IntervalMap.Generic.Base                                                                                                              
       [4 of 9] Compiling Data.IntervalMap.Generic.Strict                                                                                                            
       [5 of 9] Compiling RBColorIntBase                                                                                                                             
       [7 of 9] Compiling RBColorNodeBase                                                                                                                            
       /home/curators/work/unpack-dir/unpacked/IntervalMap-0.6.2.3-39165a8a932402ac2fa5655af95f17c275a095776354ccd74b4c30342ee49c8d/bench/RBColorIntBase.hs:348:46: e
rror: [GHC-87543]                                                                 
           Ambiguous occurrence ‘foldl'’.                                         
           It could refer to                                                                                                                                         
              either ‘Prelude.foldl'’,                                                                                                                               
                     imported from ‘Prelude’ at bench/RBColorIntBase.hs:67:1-63                                                                                      
                     (and originally defined in ‘ghc-internal-9.1204.0:GHC.Internal.Data.Foldable’),
                  or ‘RBColorIntBase.foldl'’,                                     
                     defined at bench/RBColorIntBase.hs:346:1.                    
           |                                                                                                                                                         
       348 |                          Node _ _ _ x l r -> foldl' f (f (foldl' f z l) x) r
           |                                              ^^^^^^                  
                                                                                                                                                                            /home/curators/work/unpack-dir/unpacked/IntervalMap-0.6.2.3-39165a8a932402ac2fa5655af95f17c275a095776354ccd74b4c30342ee49c8d/bench/RBColorIntBase.hs:348:59: e
rror: [GHC-87543]                                                                 
           Ambiguous occurrence ‘foldl'’.                                                                                                                            
           It could refer to                                                                                                                                         
              either ‘Prelude.foldl'’,                                                                                                                               
                     imported from ‘Prelude’ at bench/RBColorIntBase.hs:67:1-63                                                                                      
                     (and originally defined in ‘ghc-internal-9.1204.0:GHC.Internal.Data.Foldable’),
                  or ‘RBColorIntBase.foldl'’,                                                                                                                        
                     defined at bench/RBColorIntBase.hs:346:1.                                                                                                       
           |                                                                                                                                                         
       348 |                          Node _ _ _ x l r -> foldl' f (f (foldl' f z l) x) r
           |                                                           ^^^^^^

Not completely sure what changed

[bokesan]

Thanks for reporting this. Caused by newer GHC version. It was already fixed in the library and test code by PR #10 , but I forgot the benchmarks.

[juhp]

Thanks