1,3c1,3
< *** Syntax error: duplicate feature 1
< *** Syntax error: duplicate feature foo
< *** Syntax error: duplicate feature 2
---
> *** Syntax error: duplicate feature 1 (near line 3)
> *** Syntax error: duplicate feature foo (near line 4)
> *** Syntax error: duplicate feature 2 (near line 5)
