cargo-semver-checks 0.6.0

Scan your Rust crate for semver violations.
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SemverQuery(
    id: "struct_marked_non_exhaustive",
    human_readable_name: "struct marked #[non_exhaustive]",
    description: "A publicly-visible struct has been marked #[non_exhaustive], but it was previously constructible using a struct literal outside its crate. The #[non_exhaustive] attribute disables that, so this is a major breaking change for code that depends on it.",
    required_update: Major,

    // TODO: Change the reference link once this cargo docs PR merges:
    // https://github.com/rust-lang/cargo/pull/10877
    //
    // Change to this link:
    // https://doc.rust-lang.org/cargo/reference/semver.html#attr-adding-non-exhaustive
    reference_link: Some("https://doc.rust-lang.org/reference/attributes/type_system.html#the-non_exhaustive-attribute"),
    query: r#"
    {
        CrateDiff {
            current {
                item {
                    ... on Struct {
                        visibility_limit @filter(op: "=", value: ["$public"]) @output
                        name @output @tag
                        struct_type @output

                        # The struct is now marked #[non_exhaustive] so it can't be constructed
                        # using a struct literal outside of its crate. This is the breaking change.
                        attrs @filter(op: "contains", value: ["$non_exhaustive"])

                        path {
                            path @output @tag
                        }

                        span_: span @optional {
                            filename @output
                            begin_line @output
                        }
                    }
                }
            }
            baseline {
                item {
                    ... on Struct {
                        visibility_limit @filter(op: "=", value: ["$public"])
                        name @filter(op: "=", value: ["%name"])
                        attrs @filter(op: "not_contains", value: ["$non_exhaustive"])

                        # Ensure the struct could previously be constructed outside of its crate
                        # using a struct literal: it did not have any private fields.
                        field @fold @transform(op: "count") @filter(op: "=", value: ["$zero"]) {
                            visibility_limit @filter(op: "!=", value: ["$public"])
                        }

                        path {
                            path @filter(op: "=", value: ["%path"])
                        }
                    }
                }
            }
        }
    }"#,
    arguments: {
        "public": "public",
        "non_exhaustive": "#[non_exhaustive]",
        "zero": 0,
    },
    error_message: "A public struct has been marked #[non_exhaustive], which will prevent it from being constructed using a struct literal outside of its crate. It previously had no private fields, so a struct literal could be used to construct it outside its crate.",
    per_result_error_template: Some("struct {{name}} in {{span_filename}}:{{span_begin_line}}"),
)