src/test/codegen-units/item-collection/trait-method-default-impl.rs

   1 // compile-flags:-Zprint-mono-items=eager -Zpolymorphize=on
   2
   3 #![deny(dead_code)]
   4 #![feature(start)]
   5
   6 trait SomeTrait {
   7     fn foo(&self) { }
   8     fn bar<T>(&self, x: T) -> T { x }
   9 }
  10
  11 impl SomeTrait for i8 {
  12     // take the default implementations
  13
  14     // For the non-generic foo(), we should generate a codegen-item even if it
  15     // is not called anywhere
  16     //~ MONO_ITEM fn <i8 as SomeTrait>::foo
  17 }
  18
  19 trait SomeGenericTrait<T1> {
  20     fn foo(&self) { }
  21     fn bar<T2>(&self, x: T1, y: T2) {}
  22 }
  23
  24 // Non-generic impl of generic trait
  25 impl SomeGenericTrait<u64> for i32 {
  26     // take the default implementations
  27
  28     // For the non-generic foo(), we should generate a codegen-item even if it
  29     // is not called anywhere
  30     //~ MONO_ITEM fn <i32 as SomeGenericTrait<T1>>::foo
  31 }
  32
  33 // Non-generic impl of generic trait
  34 impl<T1> SomeGenericTrait<T1> for u32 {
  35     // take the default implementations
  36     // since nothing is monomorphic here, nothing should be generated unless used somewhere.
  37 }
  38
  39 //~ MONO_ITEM fn start
  40 #[start]
  41 fn start(_: isize, _: *const *const u8) -> isize {
  42     //~ MONO_ITEM fn <i8 as SomeTrait>::bar::<char>
  43     let _ = 1i8.bar('c');
  44
  45     //~ MONO_ITEM fn <i8 as SomeTrait>::bar::<&str>
  46     let _ = 2i8.bar("&str");
  47
  48     //~ MONO_ITEM fn <i32 as SomeGenericTrait<u64>>::bar::<char>
  49     0i32.bar(0u64, 'c');
  50
  51     //~ MONO_ITEM fn <i32 as SomeGenericTrait<u64>>::bar::<&str>
  52     0i32.bar(0u64, "&str");
  53
  54     //~ MONO_ITEM fn <u32 as SomeGenericTrait<i8>>::bar::<&[char; 1]>
  55     0u32.bar(0i8, &['c']);
  56
  57     //~ MONO_ITEM fn <u32 as SomeGenericTrait<i16>>::bar::<()>
  58     0u32.bar(0i16, ());
  59
  60     0
  61 }