Calling abstract type feature results in cryptic error message

[fridis]

This

f.type.n
f is
  type.n unit => abstract

produces

 > ./build/bin/fz test_abstract_type_feature.fz 

/home/fridi/fuzion/work/test_abstract_type_feature.fz:1:8: error 1: NYI: in universe#0(0 args) at 805306370 no targets for Call f.type.n(outer f.type) unit target UNIT
f.type.n
-------^
Considered targets: program entry point
    |
    +- performs call universe#0 => *** VOID *** ENV: 'NO ENV'

one error.

The corresponding errors for normal abstract features are quite nice

f.n
g : f is
g.n
f is
  n unit => abstract

results in

 > ./build/bin/fz test_abstract_feature.fz 

/home/fridi/fuzion/work/test_abstract_feature.fz:2:1: error 1: Used abstract feature 'f.n' is not implemented by 'g'
g : f is
^
Feature 'g' instantiated at /home/fridi/fuzion/work/test_abstract_feature.fz:3:1:
g.n
^
inherits or declares abstract feature 'f.n' declared at /home/fridi/fuzion/work/test_abstract_feature.fz:5:3:
  n unit => abstract
--^
which is called at /home/fridi/fuzion/work/test_abstract_feature.fz:1:3:
f.n
--^
without providing an implementation


/home/fridi/fuzion/work/test_abstract_feature.fz:4:1: error 2: Used abstract feature 'f.n' is not implemented by 'f'
f is
^
Feature 'f' instantiated at /home/fridi/fuzion/work/test_abstract_feature.fz:1:1:
f.n
^
inherits or declares abstract feature 'f.n' declared at /home/fridi/fuzion/work/test_abstract_feature.fz:5:3:
  n unit => abstract
--^
which is called at /home/fridi/fuzion/work/test_abstract_feature.fz:1:3:
f.n
--^
without providing an implementation

2 errors.