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Perform cfg attribute processing on decorator-generated items #34295

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merged 2 commits into from
Jun 19, 2016
Merged

Perform cfg attribute processing on decorator-generated items #34295

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83d283b
Avoid expanding decorator-generated items twice
jseyfried Jun 16, 2016
c41cf30
Strip unconfigured nodes from decorator-generated AST
jseyfried Jun 16, 2016
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2 changes: 0 additions & 2 deletions src/libsyntax/ext/expand.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -787,8 +787,6 @@ fn decorate(a: Annotatable, fld: &mut MacroExpander) -> SmallVector<Annotatable>
let mut decorator_items = SmallVector::zero();
let mut new_attrs = Vec::new();
expand_decorators(a.clone(), fld, &mut decorator_items, &mut new_attrs);
let decorator_items =
decorator_items.into_iter().flat_map(|a| expand_annotatable(a, fld)).collect();

let mut new_items = SmallVector::one(a.fold_attrs(new_attrs));
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@jseyfried jseyfried Jun 16, 2016 •
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decorator_items are already expanded in expand_decorators().
I mistakenly added this in #34010. Since expansion is idempotent, it didn't cause bugs, just regressed expansion performance.

new_items.push_all(decorator_items);
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