|  | // errorcheck | 
|  |  | 
|  | // Copyright 2021 The Go Authors. All rights reserved. | 
|  | // Use of this source code is governed by a BSD-style | 
|  | // license that can be found in the LICENSE file. | 
|  |  | 
|  | package p | 
|  |  | 
|  | var s string | 
|  | var b bool | 
|  | var i int | 
|  | var iface interface{} | 
|  |  | 
|  | var ( | 
|  | _ = "" + b   // ERROR "invalid operation.*mismatched types.*untyped string and bool" | 
|  | _ = "" + i   // ERROR "invalid operation.*mismatched types.*untyped string and int" | 
|  | _ = "" + nil // ERROR "invalid operation.*mismatched types.*untyped string and nil|(untyped nil)" | 
|  | ) | 
|  |  | 
|  | var ( | 
|  | _ = s + false // ERROR "invalid operation.*mismatched types.*string and untyped bool" | 
|  | _ = s + 1     // ERROR "invalid operation.*mismatched types.*string and untyped int" | 
|  | _ = s + nil   // ERROR "invalid operation.*mismatched types.*string and nil|(untyped nil)" | 
|  | ) | 
|  |  | 
|  | var ( | 
|  | _ = "" + false // ERROR "invalid operation.*mismatched types.*untyped string and untyped bool" | 
|  | _ = "" + 1     // ERROR "invalid operation.*mismatched types.*untyped string and untyped int" | 
|  | ) | 
|  |  | 
|  | var ( | 
|  | _ = b + 1         // ERROR "invalid operation.*mismatched types.*bool and untyped int" | 
|  | _ = i + false     // ERROR "invalid operation.*mismatched types.*int and untyped bool" | 
|  | _ = iface + 1     // ERROR "invalid operation.*mismatched types.*interface *{} and int" | 
|  | _ = iface + 1.0   // ERROR "invalid operation.*mismatched types.*interface *{} and float64" | 
|  | _ = iface + false // ERROR "invalid operation.*mismatched types.*interface *{} and bool" | 
|  | ) |