parser: Add tests for initial whitespace and comments in mappings file

This broke recently I think. You can no longer have a mappings file that
starts with blank lines or comment lines.

Removing the empty and blank handler in `definitions()` fixes the tests
added by this commit but fails these:

    parser::tests::map_group_empty_input_does_not_fail
    parser::tests::map_group_skipped_input_outputs_default_map_group

Using this diff:

    diff --git a/src/parser.rs b/src/parser.rs
    index 3f3d7b9..d18b56a 100644
    --- a/src/parser.rs
    +++ b/src/parser.rs
    @@ -629,11 +629,11 @@ where
         I: Stream<Item = char>,
         I::Error: ParseError<I::Item, I::Range, I::Position>,
     {
    -    or(
    -        (
    -            blank(),
    -            eof(),
    -        ).map(|_| MapGroup::default()),
    +    // or(
    +    //     (
    +    //         blank(),
    +    //         eof(),
    +    //     ).map(|_| MapGroup::default()),
             (
                 definitions(),
                 eof(),
    @@ -661,8 +661,8 @@ where
                 }

                 map_group
    -        }),
    -    )
    +        })
    +    // )
     }

     fn comment<I>() -> impl Parser<Input = I>

Need to figure out some way to get both sets of tests to pass.

0 files changed, 0 insertions, 0 deletions