id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
4123,Control.Concurrent.MVar doesn't need to depend on the Prelude,tibbe,,"`Control.Concurrent.MVar` currently depends on the `Prelude`, causing an import cycle in the new I/O manager. This patch replaces the dependency on the `Prelude` with modules in the `GHC` hierarchy, breaking the cycle. 
",bug,closed,high,7.0.1,libraries/base,6.13,fixed,,,Unknown/Multiple,Unknown/Multiple,Building GHC failed,,,,,