| // Copyright 2016 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. |
| |
| // Regression test for #47244: in this specific scenario, when the |
| // expected type indicated 1 argument but the closure takes two, we |
| // would (early on) create type variables for the type of `b`. If the |
| // user then attempts to invoke a method on `b`, we would get an error |
| // saying that the type of `b` must be known, which was not very |
| // helpful. |
| |
| // run-rustfix |
| |
| use std::collections::HashMap; |
| |
| fn main() { |
| let mut m = HashMap::new(); |
| m.insert("foo", "bar"); |
| |
| let _n = m.iter().map(|_, b| { |
| //~^ ERROR closure is expected to take a single 2-tuple |
| b.to_string() |
| }); |
| } |
