Subsequent errors after `duplicate feature` in loop.

[fridis]

This example from #302

loop_example =>

  for
    i := 1, i + 1
  while i <= 10
    i := i + 1
    say i

produces one correct error, but this error is followed by three subsequent errors that should be supressed:

 > ./build//bin/fz loop.fz 

/home/fridi/fuzion/clean/fuzion.1/loop.fz:6:5: error 1: Duplicate feature declaration
    i := i + 1

Feature that was declared repeatedly: 'loop_example.loop.i'
originally declared at /home/fridi/fuzion/clean/fuzion.1/loop.fz:4:5:
    i := 1, i + 1

To solve this, consider renaming one of these two features, e.g., as 'iʼ' (using a unicode modifier letter apostrophe 'ʼ' U+02BC) or adding an additional argument (e.g. '_ unit' for an ignored unit argument used only to disambiguate these two).


/home/fridi/fuzion/clean/fuzion.1/loop.fz:5:9: error 2: Could not find called feature
  while i <= 10

Feature not found: 'i' (no arguments)
Target feature: 'loop_example.loop'
In call: 'i'


/home/fridi/fuzion/clean/fuzion.1/loop.fz:6:10: error 3: Could not find called feature
    i := i + 1

Feature not found: 'i' (no arguments)
Target feature: 'loop_example.loop'
In call: 'i'


/home/fridi/fuzion/clean/fuzion.1/loop.fz:4:5: error 4: Could not find called feature
    i := 1, i + 1

Feature not found: 'i' (no arguments)
Target feature: 'loop_example.loop'
In call: 'i'

4 errors.