Just in case

src/builder.rs

@@ -1150,7 +1150,9 @@ impl Builder {
  // mean there could be a situation where a single crate _could_
  // be referenced with 0.0.x versions, but...I'll fix that if
  // someone reports an issue
- let rdep_version = rdep.pkg.version().parse().expect("failed to parse semver");
+ let rdep_version: semver::Version =
+ rdep.pkg.version().parse().expect("failed to parse semver");
+ let has_prelease = !rdep_version.pre.is_empty();
 
  let edges = rdep.dep_kinds.iter().filter_map(|dk| {
  let mask = match dk.kind {
@@ -1182,7 +1184,7 @@ impl Builder {
  // typically happens in the case of non-registry dependencies that use a pre-release
  // semver, if the version _is_ a prelease it will never match the empty
  // requirement
- dep.req.comparators.is_empty() || dep.req.matches(&rdep_version)
+ (has_prelease && dep.req.comparators.is_empty()) || dep.req.matches(&rdep_version)
  })
  .unwrap_or_else(|| panic!("cargo metadata resolved a dependency for a dependency not specified by the crate: {rdep:?}"));