alexcrichton opened PR #4293 from namespace-features to main:
Cargo recently added the ability to have an optional dependency without
implicitly introducing a new named feature on a crate. This is triggered
with some new directives in the[features]section, specifically:
The
dep:foosyntax means thatfoois activated but no implicit
feature should be added namedfoo.Additionally
foo?/barmeans that thebarfeature offoois only
activated iffoois otherwise activated elsewhere, for example a
conditional activation.These two features can help avoid extra feature names showing up that we
don't want (e.g. currently thewasmtimecrate has arayonfeature)
and additionally can help avoid runtime dependencies in niche cases for
us (e.g. activatingall-archbut disablingcraneliftwould
previously pull-in cranelift but no longer will).<!--
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alexcrichton has marked PR #4293 as ready for review.
fitzgen submitted PR review.
alexcrichton merged PR #4293.
Last updated: Dec 06 2025 at 06:05 UTC