sds / scss-lint / 1180

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Handle files that begin with comments in PrivateNamingConvention

After trying out this new rule, I noticed a couple of bugs. Both are
related, and one caused a crash. They both happen when the file begins
with a comment.

For some reason, if the file starts with a comment, the engine seems to
visit the function usage twice, once before it visits the function
definition, and once after. Since we are relying on the order that these
things are visited here, this causes a lint to happen.

But even worse, when visiting a variable within a for loop, the node has
no source range, which causes a crash. This only seems to happen when
the file begins with a comment.

I fixed these by making sure that things have a source range before we
determine their position, and by also checking the top level even though
we really shouldn't need to.

2 of 2 new or added lines in 1 file covered. (100.0%)

2690 of 2793 relevant lines covered (96.31%)

1452.17 hits per line