Xi Ge 9ddd60d4ef libSyntax: create syntax nodes for closure signature. (#13415) ...

This patch also refactors the structure of function signature node so
that closure signature can re-use parts of function signature. For
instance, we group arrow and return type to be "ReturnClause". And we
group parenthesized parameter list to be "ParamClause".

This structure of closure signature also calls for a good way to
represent either-or node in libSyntax APIs, since we've two ways to
specify parameters in closure: one is as regular function parameter and
the other is dot-separated simple names.

2017-12-13 16:48:24 -08:00

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