src/librustc_error_codes/error_codes/E0010.md

   1 The value of statics and constants must be known at compile time, and they live
   2 for the entire lifetime of a program. Creating a boxed value allocates memory on
   3 the heap at runtime, and therefore cannot be done at compile time.
   4
   5 Erroneous code example:
   6
   7 ```compile_fail,E0010
   8 #![feature(box_syntax)]
   9
  10 const CON : Box<i32> = box 0;
  11 ```