tests/ui/internal-lints/rustc_pass_by_value_self.rs

   1 // compile-flags: -Z unstable-options
   2 // NOTE: This test doesn't actually require `fulldeps`
   3 // so we could instead use it as a `ui` test.
   4 //
   5 // Considering that all other `internal-lints` are tested here
   6 // this seems like the cleaner solution though.
   7 #![feature(rustc_attrs)]
   8 #![deny(rustc::pass_by_value)]
   9 #![allow(unused)]
  10
  11 #[rustc_pass_by_value]
  12 struct TyCtxt<'tcx> {
  13     inner: &'tcx (),
  14 }
  15
  16 impl<'tcx> TyCtxt<'tcx> {
  17     fn by_value(self) {} // OK
  18     fn by_ref(&self) {} //~ ERROR passing `TyCtxt<'tcx>` by reference
  19 }
  20
  21 struct TyS<'tcx> {
  22     inner: &'tcx (),
  23 }
  24
  25 #[rustc_pass_by_value]
  26 type Ty<'tcx> = &'tcx TyS<'tcx>;
  27
  28 impl<'tcx> TyS<'tcx> {
  29     fn by_value(self: Ty<'tcx>) {}
  30     fn by_ref(self: &Ty<'tcx>) {} //~ ERROR passing `Ty<'tcx>` by reference
  31 }
  32
  33 #[rustc_pass_by_value]
  34 struct Foo;
  35
  36 impl Foo {
  37     fn with_ref(&self) {} //~ ERROR passing `Foo` by reference
  38 }
  39
  40 #[rustc_pass_by_value]
  41 struct WithParameters<T, const N: usize, M = u32> {
  42     slice: [T; N],
  43     m: M,
  44 }
  45
  46 impl<T> WithParameters<T, 1> {
  47     fn with_ref(&self) {} //~ ERROR passing `WithParameters<T, 1>` by reference
  48 }
  49
  50 impl<T> WithParameters<T, 1, u8> {
  51     fn with_ref(&self) {} //~ ERROR passing `WithParameters<T, 1, u8>` by reference
  52 }
  53
  54 fn main() {}