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Disallow non-boolean literals in concat!

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This commit is contained in:
Laurențiu Nicola 2021-01-25 13:30:55 +02:00
parent 6362b399ad
commit 4e92681aba
1 changed files with 4 additions and 2 deletions
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6
crates/hir_expand/src/builtin_macro.rs
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@ -331,7 +331,9 @@ fn concat_expand(
text.push_str(&component);
}
// handle boolean literals
tt::TokenTree::Leaf(tt::Leaf::Ident(id)) if i % 2 == 0 => {
tt::TokenTree::Leaf(tt::Leaf::Ident(id))
if i % 2 == 0 && (id.text == "true" || id.text == "false") =>
{
text.push_str(id.text.as_str());
}
tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if i % 2 == 1 && punct.char == ',' => (),
@ -739,7 +741,7 @@ fn test_concat_expand() {
r##"
#[rustc_builtin_macro]
macro_rules! concat {}
concat!("foo", r, 0, r#"bar"#, false);
concat!("foo", "r", 0, r#"bar"#, false);
"##,
);