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allow syntax::ext::base::MultiItemModifier to return multiple items #34223

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llogiq opened this issue Jun 11, 2016 · 1 comment
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allow syntax::ext::base::MultiItemModifier to return multiple items #34223

llogiq opened this issue Jun 11, 2016 · 1 comment

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@llogiq
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llogiq commented Jun 11, 2016 •
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As of yet, MultiItemModifiers can only return a single item, which can lead to problems with expanding macros or preprending items, e.g. extern crate foo; use foo::bar to avoid requiring users to manually import items.

A simple solution would be to change Annotatable to work on SmallVecs of Items/TraitItems/ImplItems. However, this would break all procedural macros using this interface.
@jseyfried jseyfried mentioned this issue Jun 13, 2016
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@jseyfried
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@llogiq c.f. #34253

bors added a commit that referenced this issue Jun 23, 2016
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Auto merge of #34253 - jseyfried:improve_multi_modifiers, r=nrc
3908913 
Allow `MultiItemModifier`s to expand into zero or many items

Fixes #34223.
r? @nrc
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@llogiq @jseyfried