SemverQuery(
id: "derive_helper_attr_removed",
human_readable_name: "derive proc macro helper attribute removed",
description: "A helper attribute was removed from a derive proc macro, breaking downstream code that uses the attribute in #[derive] invocations.",
required_update: Major,
lint_level: Deny,
reference_link: Some("https://doc.rust-lang.org/reference/procedural-macros.html#derive-macro-helper-attributes"),
query: r#"
{
CrateDiff {
baseline {
item {
... on DeriveProcMacro {
name @output
visibility_limit @filter(op: "=", value: ["$public"])
importable_path {
path @output @tag
public_api @filter(op: "=", value: ["$true"])
}
helper_attribute {
helper_name: name @output @tag
}
span_: span @optional {
filename @output
begin_line @output
end_line @output
}
}
}
}
current {
item {
... on DeriveProcMacro {
visibility_limit @filter(op: "=", value: ["$public"])
importable_path {
path @filter(op: "=", value: ["%path"])
}
helper_attribute @fold @transform(op: "count") @filter(op: "=", value: ["$zero"]) {
name @filter(op: "=", value: ["%helper_name"])
}
}
}
}
}
}"#,
arguments: {
"public": "public",
"zero": 0,
"true": true,
},
error_message: "A helper attribute was removed from a derive proc macro, which will prevent downstream code using this attribute with #[derive] invocations from compiling.",
per_result_error_template: Some("helper attribute #[{{helper_name}}] removed from derive macro {{name}} in {{span_filename}}:{{span_begin_line}}"),
witness: None,
)