Undefined subroutine &b::bar called at a.pm line 7.
Compilation failed in require at c.pm line 6.
BEGIN failed--compilation aborted at c.pm line 6.
Compilation failed in require at b.pm line 6.
BEGIN failed--compilation aborted at b.pm line 6.
Compilation failed in require at a.pm line 6.
BEGIN failed--compilation aborted at a.pm line 6.