Alex Hoppen f284529bd3 [libSyntax] Add a unsafe but fast SyntaxDataRef version of SyntaxData ...

In contrast to SyntaxData, SyntaxDataRef is not memory-safe, but
designed to be fast. In particular, the following guarantees from
SyntaxData are being dropped:
 - SyntaxDataRef does not retain the SyntaxArena containing its
   RawSyntax. The user of SyntaxDataRef has to provide that guarantee.
   However, that's usually pretty easily done by just retaining the
   SyntaxArena of the tree's root node.
 - The parent of a SyntaxDataRef must outlive the child node. This is
   the more tricky constraint, but if a tree is just walked top to
   bottom with nodes stored on the stack, this is given by the way the
   stack is being unrolled.

2021-03-05 16:59:54 +01:00

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