src/test/ui/regions/regions-name-undeclared.rs

   1 // Check that lifetime resolver enforces the lifetime name scoping
   2 // rules correctly in various scenarios.
   3
   4 struct Foo<'a> {
   5     x: &'a isize
   6 }
   7
   8 impl<'a> Foo<'a> {
   9     // &'a is inherited:
  10     fn m1(&self, arg: &'a isize) { }
  11     fn m2(&'a self) { }
  12     fn m3(&self, arg: Foo<'a>) { }
  13
  14     // &'b is not:
  15     fn m4(&self, arg: &'b isize) { } //~ ERROR undeclared lifetime
  16     fn m5(&'b self) { } //~ ERROR undeclared lifetime
  17     fn m6(&self, arg: Foo<'b>) { } //~ ERROR undeclared lifetime
  18 }
  19
  20 fn bar<'a>(x: &'a isize) {
  21     // &'a is visible to code:
  22     let y: &'a isize = x;
  23
  24     // &'a is not visible to *items*:
  25     type X = Option<&'a isize>; //~ ERROR undeclared lifetime
  26     enum E {
  27         E1(&'a isize) //~ ERROR undeclared lifetime
  28     }
  29     struct S {
  30         f: &'a isize //~ ERROR undeclared lifetime
  31     }
  32     fn f(a: &'a isize) { } //~ ERROR undeclared lifetime
  33
  34     // &'a CAN be declared on functions and used then:
  35     fn g<'a>(a: &'a isize) { } // OK
  36     fn h(a: Box<dyn for<'a> FnOnce(&'a isize)>) { } // OK
  37 }
  38
  39 // Test nesting of lifetimes in fn type declarations
  40 fn fn_types(a: &'a isize, //~ ERROR undeclared lifetime
  41             b: Box<dyn for<'a> FnOnce(&'a isize,
  42                                   &'b isize, //~ ERROR undeclared lifetime
  43                                   Box<dyn for<'b> FnOnce(&'a isize,
  44                                                      &'b isize)>,
  45                                   &'b isize)>, //~ ERROR undeclared lifetime
  46             c: &'a isize) //~ ERROR undeclared lifetime
  47 {
  48 }
  49
  50 pub fn main() {}