Handle missing turbofish with multiple type params in the parser

[estebank]

We currently emit an appropriate error when encountering a path with type parameters that isn't using the turbofish:

error: comparison operators cannot be chained
 --> src/main.rs:2:40
  |
2 |     let hm  = std::collections::HashMap<i128>::new();
  |                                        ^    ^
  |
help: use `::<...>` instead of `<...>` to specify type arguments
  |
2 |     let hm  = std::collections::HashMap::<i128>::new();
  |                                        ^^

but we apparently fail to handle this when multiple type parameters are provided:

error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, or an operator, found `,`
 --> src/main.rs:2:45
  |
2 |     let hm  = std::collections::HashMap<i128, i128>::new();
  |                                             ^ expected one of 7 possible tokens