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fix(resolver): hint how to resolve too-new versions #17118

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Merged
epage merged 2 commits into from
Jun 19, 2026
Merged

fix(resolver): hint how to resolve too-new versions #17118

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60af75b
test(resolver): add an eligible older versions
weihanglo Jun 19, 2026
491cd3e
fix(resolver): hint how to resolve too-new versions
weihanglo Jun 19, 2026
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27 changes: 27 additions & 0 deletions src/cargo/core/resolver/errors.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -236,6 +236,8 @@ pub(super) fn activation_error(
// give an error message that nothing was found.
let mut msg = String::new();
let mut hints = String::new();
// Whether any candidate was rejected for being newer than `min-publish-age`,
let mut has_too_new = false;
if let Some(version_candidates) = rejected_versions(registry, dep) {
let version_candidates = match version_candidates {
Ok(c) => c,
Expand All @@ -258,6 +260,7 @@ pub(super) fn activation_error(
match candidate {
IndexSummary::Candidate(summary) => {
if let Some(violation) = version_prefs.too_new(&summary) {
has_too_new = true;
let note = violation.note();
let _ = writeln!(
&mut msg,
Expand Down Expand Up @@ -423,6 +426,30 @@ pub(super) fn activation_error(
describe_path_in_context(resolver_ctx, &parent.package_id()),
);

if has_too_new {
let downgrade_to =
alt_versions(registry, dep)
.and_then(|r| r.ok())
.and_then(|candidates| {
candidates
.into_iter()
.find(|s| version_prefs.too_new(s).is_none())
});
if let Some(summary) = downgrade_to {
let _ = write!(
&mut hints,
"\nhelp: to preserve the min-publish-age, \
downgrade the requirement to \"{}\"",
summary.version(),
);
}
let _ = write!(
&mut hints,
"\nhelp: to use too-new packages anyways, \
re-resolve with `CARGO_RESOLVER_INCOMPATIBLE_PUBLISH_AGE=allow`",
);
}

if let Some(gctx) = gctx {
if let Some(offline_flag) = gctx.offline_flag() {
let _ = write!(
Expand Down
9 changes: 9 additions & 0 deletions tests/testsuite/min_publish_age.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -368,6 +368,12 @@ dependencies = [

#[cargo_test]
fn no_candidates_error() {
Package::new("bar", "0.2.0")
.pubtime("2006-07-06T00:00:00Z") // ver-req not match, old enough
.publish();
Package::new("bar", "0.3.0")
.pubtime("2006-08-05T00:00:00Z") // ver-req not match, too-new
.publish();
Package::new("bar", "1.1.0")
.pubtime("2006-08-06T00:00:00Z")
.publish();
Expand Down Expand Up @@ -412,6 +418,8 @@ fn no_candidates_error() {
version 1.3.0 is too new (published moments ago, minimum age 7 days)
location searched: `dummy-registry` index (which is replacing registry `crates-io`)
required by package `foo v0.0.0 ([ROOT]/foo)`
[HELP] to preserve the min-publish-age, downgrade the requirement to "0.2.0"
[HELP] to use too-new packages anyways, re-resolve with `CARGO_RESOLVER_INCOMPATIBLE_PUBLISH_AGE=allow`

"#]])
.run();
Expand Down Expand Up @@ -976,6 +984,7 @@ dependencies = [
version 1.1.0 is too new (published 2 days ago, minimum age 7 days)
location searched: `dummy-registry` index (which is replacing registry `crates-io`)
required by package `foo v0.0.0 ([ROOT]/foo)`
[HELP] to use too-new packages anyways, re-resolve with `CARGO_RESOLVER_INCOMPATIBLE_PUBLISH_AGE=allow`

"#]])
.run();
Expand Down