Parse T<$ty>, $ty<T>, $ty::T #945
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Previously, `peek2` was used to check for `::` or `<` following a
`None`-delimited group. However, `peek2` will look *inside*` a
`None`-delimited group, so this code would treat input like
`{{ Vec<u8> }}` as having an angle bracket *after* the `None`-delimited
group.
We now consume the `None`-delimited group by parsing it, and then use
`peek` to check for tokens that occur *after* the `None`-delimited
group.
This was referenced Mar 8, 2021
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