Previously, if you copied a signature from a trait definition such as:
```
fn foo<'a>(&'a Bar) -> bool {}
```
and moved it into an `impl`, there would be an error message:
"unexpected token `'a`"
Adding to the error message that a pattern is expected should help
users to find the actual problem with using a lifetime here.
// Parse &pat / &mut pat
try!(self.expect_and());
let mutbl = try!(self.parse_mutability());
+ if let token::Lifetime(ident) = self.token {
+ return Err(self.fatal(&format!("unexpected lifetime `{}` in pattern", ident)));
+ }
+
let subpat = try!(self.parse_pat_nopanic());
pat = PatRegion(subpat, mutbl);
}
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn test(&'a str) {
+ //~^ ERROR unexpected lifetime `'a` in pattern
+}
+
+fn main() {
+}