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rust-lang / rfcs Public

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Version-typed cfgs#3905

Open

tmandry wants to merge 44 commits intorust-lang:masterrust-lang/rfcs:masterfrom

tmandry:cfg-version-typedtmandry/rfcs:cfg-version-typedCopy head branch name to clipboard

Conversation Commits44 (44)Checks Files changed

Open

Version-typed cfgs#3905
tmandry wants to merge 44 commits intorust-lang:masterfrom
tmandry:cfg-version-typed

Commits

Commits on Jan 7, 2026

Add typed cfgs RFC
tmandry
committed
Improve guide-level section and motivation
tmandry
committed
Clarify that = with version is a hard error
tmandry
committed
Don't lint on potential future editions
tmandry
committed
Generalize to any number of version components
tmandry
committed
Clean up wording in reference-level and alternatives sections
tmandry
committed
Reference-level: Version-typed cfgs as options
tmandry
committed

Commits on Jan 8, 2026

Clarify what happens when the same cfg is specified multiple times
tmandry
committed
Elaborate the diagnostic use case
tmandry
committed
Fix parsing ambiguity in check-cfg
tmandry
committed
Elaborate check-cfg possibilities
tmandry
committed
Clarify check-cfg version() behavior
tmandry
committed

Commits on Jan 9, 2026

Rename feature to version_cfgs
tmandry
committed
Drawbacks wording
tmandry
committed
Include more prior art from RFC 3857
tmandry
committed
Include more points from RFC 3857
tmandry
committed
Rename RFC to version-typed cfgs
tmandry
committed
Expand versioning systems section
tmandry
committed
Mention link between --print cfg and =
tmandry
committed
Make "print cfg" an unresolved question
tmandry
committed
Future possibility for sys crates
tmandry
committed

Commits on Jan 13, 2026

Add context on RFC 2523 to motivation
tmandry
committed
Clarify language around pre-releases
tmandry
committed
Respond to feedback on compiler flag section
tmandry
committed
Break out reference-level section for builtin cfgs
tmandry
committed
Add reference-level section on lint names
tmandry
committed
Explicitly don't specify language pre-release behavior
tmandry
committed
Split apart compiler flag section
tmandry
committed
Improve version predicate definition
tmandry
committed

Commits on Jan 14, 2026

Add perfect-enemy-good drawback
tmandry
committed
Rework rationale and alternatives
tmandry
committed

Commits on Jan 16, 2026

Remove bullets from motivation
tmandry
committed
Clarify behavior of version_constraint_unknown_version lint for future versions
tmandry
committed

Commits on Jan 17, 2026

Make version_constraint_unknown_version lint for future versions
tmandry
committed
Add "maintaining an MSRV" guide-level section
tmandry
committed
Add drawback about feature checks prior to rust_version
tmandry
committed
Add Python package version system
tmandry
committed
Clarify version() must contain valid version_literal
tmandry
committed
Revert "Add drawback about feature checks prior to rust_version"
tmandry
committed
Add drawback about feature checks prior to rust_version
tmandry
committed
Add unresolved question about exposing version cfgs in the environment
tmandry
committed
cargo hack
tmandry
committed
Replace "version component" with "version field"
tmandry
committed
Remove support for pre-releases
tmandry
committed

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