rust-analyzer/crates/hir-def/src/macro_expansion_tests/proc_macros.rs

//! Tests for user-defined procedural macros.
//!
//! Note `//- proc_macros: identity` fixture metas in tests -- we don't use real
//! proc-macros here, as that would be slow. Instead, we use several hard-coded
//! in-memory macros.
use expect_test::expect;

use crate::macro_expansion_tests::check;

#[test]
fn attribute_macro_attr_censoring() {
    cov_mark::check!(attribute_macro_attr_censoring);
    check(
        r#"
//- proc_macros: identity
#[attr1] #[proc_macros::identity] #[attr2]
struct S;
"#,
        expect![[r##"
#[attr1] #[proc_macros::identity] #[attr2]
struct S;

#[attr1]
#[attr2] struct S;"##]],
    );
}

#[test]
fn derive_censoring() {
    cov_mark::check!(derive_censoring);
    check(
        r#"
//- proc_macros: derive_identity
//- minicore:derive
#[attr1]
#[derive(Foo)]
#[derive(proc_macros::DeriveIdentity)]
#[derive(Bar)]
#[attr2]
struct S;
"#,
        expect![[r##"
#[attr1]
#[derive(Foo)]
#[derive(proc_macros::DeriveIdentity)]
#[derive(Bar)]
#[attr2]
struct S;

#[attr1]
#[derive(Bar)]
#[attr2] struct S;"##]],
    );
}

#[test]
fn attribute_macro_syntax_completion_1() {
    // this is just the case where the input is actually valid
    check(
        r#"
//- proc_macros: identity_when_valid
#[proc_macros::identity_when_valid]
fn foo() { bar.baz(); blub }
"#,
        expect![[r##"
#[proc_macros::identity_when_valid]
fn foo() { bar.baz(); blub }

fn foo() {
    bar.baz();
    blub
}"##]],
    );
}

#[test]
fn attribute_macro_syntax_completion_2() {
    // common case of dot completion while typing
    check(
        r#"
//- proc_macros: identity_when_valid
#[proc_macros::identity_when_valid]
fn foo() { bar.; blub }
"#,
        expect![[r##"
#[proc_macros::identity_when_valid]
fn foo() { bar.; blub }

fn foo() {
    bar.;
    blub
}"##]],
    );
}

#[test]
fn float_parsing_panic() {
    // Regression test for https://github.com/rust-lang/rust-analyzer/issues/12211
    check(
        r#"
//- proc_macros: identity
macro_rules! id {
    ($($t:tt)*) => {
        $($t)*
    };
}
id /*+errors*/! {
    #[proc_macros::identity]
    impl Foo for WrapBj {
        async fn foo(&self) {
            self.0. id().await;
        }
    }
}
"#,
        expect![[r##"
macro_rules! id {
    ($($t:tt)*) => {
        $($t)*
    };
}
/* parse error: expected SEMICOLON */
#[proc_macros::identity] impl Foo for WrapBj {
    async fn foo(&self ) {
        self .0.id().await ;
    }
}
"##]],
    );
}