ImportC octal literals: difference between GCC and dmd

[Steven Schveighoffer]

On 11/28/21 5:10 PM, forkit wrote:

> It 'appears' that this commit (24th May 2021) caused this issue (see 
> link below). Presumably, only those versions after this commit will be 
> affected.
> 
> https://github.com/dlang/dmd/commit/790b1268128f10878f9b782fea8f2e14da203759#diff-6204b7c3e9bc498b31aac8499c84b946d9d1f5a90858dd7522630a8a31cf5938 
> 

There are 2 related problems:

1. The D compiler does not accept decimals like `08.5` but the grammar does.
2. The ImportC compiler does not accept decimals like `08.5` but C11 
allows it.

Problem 1 existed long before problem 2 (which was only recently added). 
The code that checks for ImportC mode to print the error is kind of a 
red herring -- if that wasn't there, it still would error out when it 
reached the second check (which is still there).

-Steve