Can AstNode.root return anything other than a CompilationUnit?

[dark...@gmail.com]

Hello!

I was using AstNode.root earlier to search for the CompilationUnit of a given node.

Yet I wouldn't help but wonder: Since AstNode.root is typed as AstNode, not CompilationUnit, when could it return something other than a CompilationUnit?

Thanks!

[Brian Wilkerson]

When we serialize the element model (our summary files) we need to capture the constant expressions used in `const` constructors (so that we can evaluate them as part of constant evaluation). When we deserialize those expressions they are not attached to a full AST structure, so the `root` of any node in that structure will be the top-most node in the representation of the expression. Unless you're accessing those expressions (which are not available through the public API), the `root` should always be a `CompilationUnit`.

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