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macro_rules: NtLifetime cannot start with an identifier
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petrochenkov committed Apr 4, 2020
1 parent 49dc2f9 commit 106b30e
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Showing 2 changed files with 14 additions and 1 deletion.
2 changes: 1 addition & 1 deletion src/librustc_expand/mbe/macro_parser.rs
Original file line number Diff line number Diff line change
Expand Up @@ -768,7 +768,7 @@ fn may_begin_with(token: &Token, name: Name) -> bool {
/// Checks whether the non-terminal may contain a single (non-keyword) identifier.
fn may_be_ident(nt: &token::Nonterminal) -> bool {
match *nt {
token::NtItem(_) | token::NtBlock(_) | token::NtVis(_) => false,
token::NtItem(_) | token::NtBlock(_) | token::NtVis(_) | token::NtLifetime(_) => false,
_ => true,
}
}
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13 changes: 13 additions & 0 deletions src/test/ui/macros/issue-70446.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
// check-pass

macro_rules! foo {
($(: $p:path)? $(: $l:lifetime)? ) => { bar! {$(: $p)? $(: $l)? } };
}

macro_rules! bar {
($(: $p:path)? $(: $l:lifetime)? ) => {};
}

foo! {: 'a }

fn main() {}

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