salsa/tests/interned-struct-with-lifetime.rs

//! Test that a `tracked` fn on a `salsa::input`
//! compiles and executes successfully.
mod common;
use common::{HasLogger, Logger};

use expect_test::expect;
use test_log::test;

#[salsa::db]
trait Db: salsa::Database + HasLogger {}

#[salsa::interned]
struct InternedString<'db> {
    data: String,
}

#[salsa::interned]
struct InternedPair<'db> {
    data: (InternedString<'db>, InternedString<'db>),
}

#[salsa::tracked]
fn intern_stuff(db: &dyn Db) -> String {
    let s1 = InternedString::new(db, "Hello, ".to_string());
    let s2 = InternedString::new(db, "World, ".to_string());
    let s3 = InternedPair::new(db, (s1, s2));
    format!("{s3:?}")
}

#[salsa::db]
#[derive(Default)]
struct Database {
    storage: salsa::Storage<Self>,
    logger: Logger,
}

#[salsa::db]
impl salsa::Database for Database {}

#[salsa::db]
impl Db for Database {}

impl HasLogger for Database {
    fn logger(&self) -> &Logger {
        &self.logger
    }
}

#[test]
fn execute() {
    let mut db = Database::default();

    expect![[r#"
        "InternedPair { data: (InternedString { data: \"Hello, \" }, InternedString { data: \"World, \" }) }"
    "#]].assert_debug_eq(&intern_stuff(&db));
    db.assert_logs(expect!["[]"]);
}