diff options
Diffstat (limited to 'src/libsyntax/ext/trace_macros.rs')
| -rw-r--r-- | src/libsyntax/ext/trace_macros.rs | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/src/libsyntax/ext/trace_macros.rs b/src/libsyntax/ext/trace_macros.rs index 3fcc6a8d692..646e6fec405 100644 --- a/src/libsyntax/ext/trace_macros.rs +++ b/src/libsyntax/ext/trace_macros.rs @@ -28,12 +28,11 @@ pub fn expand_trace_macros(cx: &mut ExtCtxt, return base::DummyResult::any(sp); } - - match tt { - [ast::TtToken(_, ref tok)] if tok.is_keyword(keywords::True) => { + match (tt.len(), tt.first()) { + (1, Some(&ast::TtToken(_, ref tok))) if tok.is_keyword(keywords::True) => { cx.set_trace_macros(true); } - [ast::TtToken(_, ref tok)] if tok.is_keyword(keywords::False) => { + (1, Some(&ast::TtToken(_, ref tok))) if tok.is_keyword(keywords::False) => { cx.set_trace_macros(false); } _ => cx.span_err(sp, "trace_macros! accepts only `true` or `false`"), |