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get rid of old todo

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mark 2020-04-29 21:13:35 -05:00 committed by Who? Me?!
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src/macro-expansion.md
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@ -273,8 +273,6 @@ Primary structures:
- MacResult - a "polymorphic" AST fragment, something that can turn into a different AstFragment depending on its context (aka AstFragmentKind - item, or expression, or pattern etc.)
- Invocation/InvocationKind - a structure describing a macro call, these structures are collected by the expansion infra (InvocationCollector), queued, resolved, expanded when resolved, etc.
TODO: how a crate transitions from the state "macros exist as written in source" to "all macros are expanded"
Hygiene and Expansion Heirarchies
- Expansion is lazy. We work from the outside of a macro invocation inward.