GHC-7.8 warning on rules that may not fire

With GHC-7.8 I get lots of warnings like src/Foo/Bar.hs:215:6: Warning: Rule "foo" may never fire because ‘bar’ might inline first Probable fix: add an INLINE[n] or NOINLINE[n] pragma on ‘bar’ So far I thought that rewrite RULES always have precedence to INLINE. Has this changed? I hesitate to follow the advice of adding phase numbers in bracket because I consider these phase numbers a quite fragile and non-modular solution (like precedence numbers for infix operators). I have found: https://ghc.haskell.org/trac/ghc/wiki/Plugins/Phases Is this still considered for future developments?