Demystifying SyntaxParsingContext [Compound variable names]

[owenv (Owen Voorhees)]

@Jumhyn

Big picture question is, what role does it play in the parsing process as opposed to the "normal" AST?

SyntaxParsingContext is used to help build the libSyntax/SwiftSyntax tree at the same time as the parser is constructing the semantic AST. Integrating libSyntax into the compiler pipeline has a helpful overview of the current model (and how it might change in the future, the proposed changes from that post aren't on master yet).

@Jumhyn

But beyond the big picture question, I'm also unsure what the correct way is to extend this portion of the code to handle compound names.

I'm not sure what's the best way to handle this, but @rintaro might have some ideas.