Bug in ^^

[Vladimir Panteleev]

On Tuesday, 17 September 2019 at 01:53:12 UTC, Brett wrote:
> 10^^16 = 1874919424	???
>
> 10L^^16 is valid, but
>
> enum x = 10^^16 gives wrong value.
>
> I didn't catch this ;/

The same can be observed with multiplication:

// This compiles, but the result is "non-sensical" due to oveflow.
enum n = 1_000_000 * 1_000_000;

The same can happen with C:

static const int n = 1000000 * 1000000;

However, C compilers warn about this:

gcc:

test.c:1:30: warning: integer overflow in expression of type 
‘int’ results in ‘-727379968’ [-Woverflow]
     1 | static const int n = 1000000 * 1000000;
       |                              ^

clang:

test.c:1:30: warning: overflow in expression; result is 
-727379968 with type 'int' [-Winteger-overflow]
static const int n = 1000000 * 1000000;
                              ^
1 warning generated.

I think D should warn about any overflows which happen at 
compile-time too.