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b5d7da878f
They are two different ways of creating dummy results, with two different purposes. Their implementations are separate except for crates, where `DummyResult` depends on `DummyAstNode`. This commit removes that dependency, so they are now fully separate. It also expands the comment on `DummyAstNode`.
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: