src/tools/clippy/tests/ui/let_underscore_untyped.rs

   1 //@aux-build: proc_macros.rs:proc-macro
   2
   3 #![allow(unused)]
   4 #![warn(clippy::let_underscore_untyped)]
   5
   6 extern crate proc_macros;
   7 use proc_macros::with_span;
   8
   9 use clippy_utils::is_from_proc_macro;
  10 use std::future::Future;
  11 use std::{boxed::Box, fmt::Display};
  12
  13 fn a() -> u32 {
  14     1
  15 }
  16
  17 fn b<T>(x: T) -> T {
  18     x
  19 }
  20
  21 fn c() -> impl Display {
  22     1
  23 }
  24
  25 fn d(x: &u32) -> &u32 {
  26     x
  27 }
  28
  29 fn e() -> Result<u32, ()> {
  30     Ok(1)
  31 }
  32
  33 fn f() -> Box<dyn Display> {
  34     Box::new(1)
  35 }
  36
  37 fn g() -> impl Fn() {
  38     || {}
  39 }
  40
  41 with_span!(
  42     span
  43
  44     fn dont_lint_proc_macro() {
  45         let _ = a();
  46     }
  47 );
  48
  49 fn main() {
  50     let _ = a();
  51     let _ = b(1);
  52     let _ = c();
  53     let _ = d(&1);
  54     let _ = e();
  55     let _ = f();
  56     let _ = g();
  57     let closure = || {};
  58
  59     _ = a();
  60     _ = b(1);
  61     _ = c();
  62     _ = d(&1);
  63     _ = e();
  64     _ = f();
  65
  66     let _: u32 = a();
  67     let _: u32 = b(1);
  68     let _: &u32 = d(&1);
  69     let _: Result<_, _> = e();
  70     let _: Box<_> = f();
  71
  72     #[allow(clippy::let_underscore_untyped)]
  73     let _ = a();
  74 }