let missing_pats = variants_of_enums
.into_iter()
.multi_cartesian_product()
+ .inspect(|_| cov_mark::hit!(fill_match_arms_lazy_computation))
.map(|variants| {
let patterns =
variants.into_iter().filter_map(|variant| build_pat(ctx.db(), module, variant));
mod tests {
use ide_db::helpers::FamousDefs;
- use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
+ use crate::tests::{
+ check_assist, check_assist_not_applicable, check_assist_target, check_assist_unresolved,
+ };
use super::fill_match_arms;
}"#,
);
}
+
+ #[test]
+ fn lazy_computation() {
+ // Computing a single missing arm is enough to determine applicability of the assist.
+ cov_mark::check_count!(fill_match_arms_lazy_computation, 1);
+ check_assist_unresolved(
+ fill_match_arms,
+ r#"
+enum A { One, Two, }
+fn foo(tuple: (A, A)) {
+ match $0tuple {};
+}
+"#,
+ );
+ }
}