Full line of comments parsed as an `operator_identifier`

[ckipp01]

Maybe an odd use case but I have a code base with comments like:

//////////////////
// MAIN MODULES //
//////////////////

And this ends up parsing as:

operator_identifier [24, 6] - [24, 27]
comment [25, 6] - [25, 27]
operator_identifier [26, 6] - [26, 27]

When it should really just be 3 comments.

[eed3si9n]

It seems like it requires some code around it like:

val y = x

/////////////////////
// Foo             //
/////////////////////

then ///////////////////// gets highlighted as an operator.

[eed3si9n]

Here's my PR for this - #140