Could we number only the problem line?

[philderbeast]

When reporting errors with project files (and cabal files):

    1 | packages: .
    2 | 
    3 | -- This is an error; a trailing `:` is syntax for a field, not a stanza!
    4 | source-repository-package:
      | ^

Do we need all of lines 1..4? Could we number only the problem line and include the lines above and below, unnumbered. This is what GHC does, isn't it?

Originally posted by @philderbeast in #8889 (comment)