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

   1 #![feature(plugin, const_fn)]
   2
   3
   4 #![allow(dead_code)]
   5 #![warn(new_without_default, new_without_default_derive)]
   6
   7 pub struct Foo;
   8
   9 impl Foo {
  10     pub fn new() -> Foo { Foo }
  11 }
  12
  13 pub struct Bar;
  14
  15 impl Bar {
  16     pub fn new() -> Self { Bar }
  17 }
  18
  19 pub struct Ok;
  20
  21 impl Ok {
  22     pub fn new() -> Self { Ok }
  23 }
  24
  25 impl Default for Ok {
  26     fn default() -> Self { Ok }
  27 }
  28
  29 pub struct Params;
  30
  31 impl Params {
  32     pub fn new(_: u32) -> Self { Params }
  33 }
  34
  35 pub struct GenericsOk<T> {
  36     bar: T,
  37 }
  38
  39 impl<U> Default for GenericsOk<U> {
  40     fn default() -> Self { unimplemented!(); }
  41 }
  42
  43 impl<'c, V> GenericsOk<V> {
  44     pub fn new() -> GenericsOk<V> { unimplemented!() }
  45 }
  46
  47 pub struct LtOk<'a> {
  48     foo: &'a bool,
  49 }
  50
  51 impl<'b> Default for LtOk<'b> {
  52     fn default() -> Self { unimplemented!(); }
  53 }
  54
  55 impl<'c> LtOk<'c> {
  56     pub fn new() -> LtOk<'c> { unimplemented!() }
  57 }
  58
  59 pub struct LtKo<'a> {
  60     foo: &'a bool,
  61 }
  62
  63 impl<'c> LtKo<'c> {
  64     pub fn new() -> LtKo<'c> { unimplemented!() }
  65     // FIXME: that suggestion is missing lifetimes
  66 }
  67
  68 struct Private;
  69
  70 impl Private {
  71     fn new() -> Private { unimplemented!() } // We don't lint private items
  72 }
  73
  74 struct Const;
  75
  76 impl Const {
  77     pub const fn new() -> Const { Const } // const fns can't be implemented via Default
  78 }
  79
  80 pub struct IgnoreGenericNew;
  81
  82 impl IgnoreGenericNew {
  83     pub fn new<T>() -> Self { IgnoreGenericNew } // the derived Default does not make sense here as the result depends on T
  84 }
  85
  86 fn main() {}