swift234

The isGroupingParen() predicate doesn't make sense since TupleExpr can be used to create tuple expressions out of a scalar when there is a single element involved.  In this case, isGroupingParen would return true but the source and dest types would be different.

This didn't manifest as a bug yet, but it doesn't make sense to wait until it does.  This aspect of grouping parens is a syntactic issue, so make the creator of TupleExpr specify whether the expr is a grouping paren or not and persist this.

Swift SVN r312