Gabriel Scherer 1852d50231 parser: use braces around tuples, not parentheses
This is the syntax we use in the printer. It has the advantage of
making the printing (and parsing) of tuple types unambiguous, even for
tuples of type 0 or 1:
- `(int)` could be `int` or a 1-ary tuple
- `{int}` can only be a 1-ary tuple
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