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macros: stackless expansion#36214

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bors merged 19 commits intorust-lang:masterrust-lang/rust:masterfrom

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Sep 8, 2016

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Commits on Sep 5, 2016

• In `Parser` and `ExtCtxt`, replace fields `filename` and `mod_path_stack`

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• Improve `expand_type`.

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• Remove `syntax::config::strip_unconfigured`, add `syntax::config::features`.

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• Add `Invocation` and `Expansion`, remove `MacroGenerable`.

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• Refactor `with_exts_frame` from a macro to a function.

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• Generalize `Invocation` to include modifiers/decorators.

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• Refactor away `expand_item`.

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• Refactor out `expand_item` (with better semantics than before).

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• Clean up module processing.

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• Refactor `expand_*` into `expander.fold_*`.

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• Refactor `SyntaxEnv`.

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• Refactor `expand_invoc(.., fld)` -> `self.expand_invoc(..)`.

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• Add module `ext::placeholders` with `placeholder()` and `PlaceholderExpander`.

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• Implement stackless expansion.

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• Load macros from `extern crate`s in the `InvocationCollector` fold.

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Commits on Sep 7, 2016

• Refactor code out of the folder implementation for `StripUnconfigured`.

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• Strip unconfigured nodes in the `InvocationCollector` fold.

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• Implement stackless placeholder expansion.

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• Improve `directory` computation during invocation collection.

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