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//! Test that `$var:expr` captures function correctly.

use expect_test::expect;

use crate::macro_expansion_tests::check;

#[test]
fn unary_minus_is_a_literal() {
    check(
        r#"
macro_rules! m { ($x:literal) => (literal!();); ($x:tt) => (not_a_literal!();); }
m!(92);
m!(-92);
m!(-9.2);
m!(--92);
"#,
        expect![[r#"
macro_rules! m { ($x:literal) => (literal!();); ($x:tt) => (not_a_literal!();); }
literal!();
literal!();
literal!();
/* error: leftover tokens */not_a_literal!();
"#]],
    )
}

#[test]
fn test_expand_bad_literal() {
    check(
        r#"
macro_rules! m { ($i:literal) => {}; }
m!(&k");
"#,
        expect![[r#"
macro_rules! m { ($i:literal) => {}; }
/* error: Failed to lower macro args to token tree */"#]],
    );
}

#[test]
fn test_empty_comments() {
    check(
        r#"
macro_rules! m{ ($fmt:expr) => (); }
m!(/**/);
"#,
        expect![[r#"
macro_rules! m{ ($fmt:expr) => (); }
/* error: expected Expr */
"#]],
    );
}