[Macros] Accessing the "parent context" of a syntax node passed to a macro

Evolution Pitches
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Hey all,

I am finally back to looking at this, with an updated implementation. based on the discussion here. The API is this:

  /// Return an array of enclosing lexical contexts for the purpose of macros,
  /// starting from the syntax node at which the macro expansion occurs
  /// and containing all "context" nodes including functions, closures, types,
  /// properties, subscripts, and extensions.
  ///
  /// Lexical contexts will have many of their details stripped out to prevent
  /// macros from having visibility into unrelated code. For example, functions
  /// and closures have their bodies removed, types and extensions have their
  /// member lists emptied, and properties and subscripts have their accessor
  /// blocks removed.
  ///
  /// The first entry in the array is the innermost context, which could be
  /// the syntax node to which
  var lexicalContext: [Syntax] { get }

And with the new implementation, it's tied in with the compiler.

Doug

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