rust-lang/cargo · error

checksum for ` ` could not be calculated, but a checksum is…

Error message

checksum for `{}` could not be calculated, but a checksum is listed in the existing lock file

this could be indicative of a few possible situations:

    * the source `{}` supports checksums,
      but was replaced with one that doesn't
    * the lock file is corrupt

unable to verify that `{0}` is the same as when the lockfile was generated

What it means

Error "checksum for `{}` could not be calculated, but a checksum is listed in the existing lock file this could be indicative of a few possible situations: * the source `{}` supports checksums, but was replaced with one that doesn't * the lock file is corrupt unable to verify that `{0}` is the same as when the lockfile was generated " thrown in rust-lang/cargo.

When it happens

Trigger: Thrown at src/resolver/resolve.rs:259 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rust-lang/cargo@eb98b54bc9 (2026-08-11). Data as JSON: /api/errors/1ea7ab8f19ba74f7. Report an issue: GitHub.

Appendix: source

Thrown at src/resolver/resolve.rs:259

this could be indicative of a few possible situations:

    * the source `{}` did not previously support checksums,
      but was replaced with one that does
    * newer Cargo implementations know how to checksum this source, but this
      older implementation does not
    * the lock file is corrupt
",
                        id,
                        id.source_id()
                    )

                // If our checksum hasn't been calculated, then it could mean
                // that future Cargo figured out how to checksum something or
                // more realistically we were overridden with a source that does
                // not have checksums.
                } else if mine.is_none() {
                    anyhow::bail!(
                        "\
checksum for `{}` could not be calculated, but a checksum is listed in \
the existing lock file

this could be indicative of a few possible situations:

    * the source `{}` supports checksums,
      but was replaced with one that doesn't
    * the lock file is corrupt

unable to verify that `{0}` is the same as when the lockfile was generated
",
                        id,
                        id.source_id()
                    )

                // If the checksums aren't equal, and neither is None, then they
                // must both be Some, in which case the checksum now differs.

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