src/test/ui/consts/const-eval/infinite_loop.stderr

   1 error[E0658]: `while` is not allowed in a `const`
   2   --> $DIR/infinite_loop.rs:7:9
   3    |
   4 LL | /         while n != 0 {
   5 LL | |
   6 LL | |             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
   7 LL | |
   8 LL | |
   9 LL | |         }
  10    | |_________^
  11    |
  12    = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
  13    = help: add `#![feature(const_loop)]` to the crate attributes to enable
  14    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
  15
  16 error[E0658]: `if` is not allowed in a `const`
  17   --> $DIR/infinite_loop.rs:9:17
  18    |
  19 LL |             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
  20    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  21    |
  22    = note: see issue #49146 <https://github.com/rust-lang/rust/issues/49146> for more information
  23    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
  24
  25 warning: Constant evaluating a complex constant, this might take some time
  26   --> $DIR/infinite_loop.rs:4:18
  27    |
  28 LL |       let _ = [(); {
  29    |  __________________^
  30 LL | |
  31 LL | |         let mut n = 113383; // #20 in https://oeis.org/A006884
  32 LL | |         while n != 0 {
  33 ...  |
  34 LL | |         n
  35 LL | |     }];
  36    | |_____^
  37
  38 error[E0080]: evaluation of constant value failed
  39   --> $DIR/infinite_loop.rs:9:20
  40    |
  41 LL |             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
  42    |                    ^^^^^^^^^^ duplicate interpreter state observed here, const evaluation will never terminate
  43
  44 error: aborting due to 3 previous errors
  45
  46 Some errors have detailed explanations: E0080, E0658.
  47 For more information about an error, try `rustc --explain E0080`.