foo: &foo
a: foo_a
thing: foo_thing
c: foo_c
bar: &bar
b: bar_b
thing: bar_thing
c: bar_c
foobarList:
b: foobarList_b
<<: [*foo,*bar]
c: foobarList_c
foobar:
c: foobar_c
<<: *foo
thing: foobar_thing