T2600.hs:16:1: warning: [-Winline-rule-shadowing (in -Wdefault)]
    Rule "myrule" may never fire
      because rule "Class op tmap" for ‘tmap’ might fire first
    Probable fix: add phase [n] or [~n] to the competing rule

T2600.hs:16:1: warning: [-Winline-rule-shadowing (in -Wdefault)]
    Rule "myrule" may never fire
      because rule "Class op to" for ‘to’ might fire first
    Probable fix: add phase [n] or [~n] to the competing rule