emerge -auv bash --debug
myaction None
myopts {'--debug': True, '--ask': True, '--update': True, '--verbose': True}

These are the packages that would be merged, in order:

Calculating dependencies  
Parent:    None
Depstring: app-shells/bash
Priority: soft
Candidates: ['app-shells/bash']
   ebuild: app-shells/bash-3.2_p3-r1                                                                                                                                               -
Parent:    ebuild / app-shells/bash-3.2_p3-r1 merge
Depstring: >=sys-libs/ncurses-5.2-r2
Priority: hard
Candidates: ['>=sys-libs/ncurses-5.2-r2']
   ebuild: sys-libs/ncurses-5.5-r3                                                                                                                                                 \Exiting... ebuild / app-shells/bash-3.2_p3-r1 merge

Parent:    ebuild / app-shells/bash-3.2_p3-r1 merge
Depstring: >=sys-libs/ncurses-5.2-r2
Priority: medium
Candidates: ['>=sys-libs/ncurses-5.2-r2']
   ebuild: sys-libs/ncurses-5.5-r3
Exiting... ebuild / app-shells/bash-3.2_p3-r1 merge
Exiting... None                                                                                                                                                                   ... done!
[ebuild     U ] app-shells/bash-3.2_p3-r1 [3.1_p17] USE="-afs -bashlogger -nls -vanilla" 0 kB 

Total size of downloads: 0 kB