Fix range parsing

[resolritter]

Problem: https://github.com/tree-sitter/tree-sitter-rust/pull/100 solved https://github.com/tree-sitter/tree-sitter-rust/issues/86 but then it introduced collateral issues such as https://github.com/tree-sitter/tree-sitter-rust/issues/107 and https://github.com/tree-sitter/tree-sitter-rust/issues/121. Those breakages were not caught because we didn't have tests for them.

Solution:

• Work around the problem without having to mess with precedence values
• Add more tests

[maxbrunsfeld]

Really nice work @resolritter, and thanks for spending some time to merge PRs @aryx.

[narpfel]

Thanks!