src/test/compile-fail/reject-specialized-drops-8142.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Issue 8142: Test that Drop impls cannot be specialized beyond the
  12 // predicates attached to the struct/enum definition itself.
  13
  14 trait Bound { fn foo(&self) { } }
  15 struct K<'l1,'l2> { x: &'l1 i8, y: &'l2 u8 }
  16 struct L<'l1,'l2> { x: &'l1 i8, y: &'l2 u8 }
  17 struct M<'m> { x: &'m i8 }
  18 struct N<'n> { x: &'n i8 }
  19 struct O<To> { x: *const To }
  20 struct P<Tp> { x: *const Tp }
  21 struct Q<Tq> { x: *const Tq }
  22 struct R<Tr> { x: *const Tr }
  23 struct S<Ts:Bound> { x: *const Ts }
  24 struct T<'t,Ts:'t> { x: &'t Ts }
  25 struct U;
  26 struct V<Tva, Tvb> { x: *const Tva, y: *const Tvb }
  27 struct W<'l1, 'l2> { x: &'l1 i8, y: &'l2 u8 }
  28
  29 impl<'al,'adds_bnd:'al> Drop for K<'al,'adds_bnd> {                        // REJECT
  30     //~^ ERROR The requirement `'adds_bnd : 'al` is added only by the Drop impl.
  31     fn drop(&mut self) { } }
  32
  33 impl<'al,'adds_bnd>     Drop for L<'al,'adds_bnd> where 'adds_bnd:'al {    // REJECT
  34     //~^ ERROR The requirement `'adds_bnd : 'al` is added only by the Drop impl.
  35     fn drop(&mut self) { } }
  36
  37 impl<'ml>               Drop for M<'ml>         { fn drop(&mut self) { } } // ACCEPT
  38
  39 impl                    Drop for N<'static>     { fn drop(&mut self) { } } // REJECT
  40 //~^ ERROR mismatched types
  41 //~| expected type `N<'n>`
  42 //~|    found type `N<'static>`
  43
  44 impl<Cok_nobound> Drop for O<Cok_nobound> { fn drop(&mut self) { } } // ACCEPT
  45
  46 impl              Drop for P<i8>          { fn drop(&mut self) { } } // REJECT
  47 //~^ ERROR Implementations of Drop cannot be specialized
  48
  49 impl<Adds_bnd:Bound> Drop for Q<Adds_bnd> { fn drop(&mut self) { } } // REJECT
  50 //~^ ERROR The requirement `Adds_bnd: Bound` is added only by the Drop impl.
  51
  52 impl<'rbnd,Adds_rbnd:'rbnd> Drop for R<Adds_rbnd> { fn drop(&mut self) { } } // REJECT
  53 //~^ ERROR The requirement `Adds_rbnd : 'rbnd` is added only by the Drop impl.
  54
  55 impl<Bs:Bound>    Drop for S<Bs>          { fn drop(&mut self) { } } // ACCEPT
  56
  57 impl<'t,Bt:'t>    Drop for T<'t,Bt>       { fn drop(&mut self) { } } // ACCEPT
  58
  59 impl              Drop for U              { fn drop(&mut self) { } } // ACCEPT
  60
  61 impl<One>         Drop for V<One,One>     { fn drop(&mut self) { } } // REJECT
  62 //~^ ERROR Implementations of Drop cannot be specialized
  63
  64 impl<'lw>         Drop for W<'lw,'lw>     { fn drop(&mut self) { } } // REJECT
  65 //~^ ERROR cannot infer an appropriate lifetime
  66
  67 pub fn main() { }