Simplification of @trusted

[jmh530]

On Wednesday, 16 June 2021 at 21:22:32 UTC, Walter Bright wrote:
> [snip]
>> `@trusted` *should* probably not even be available for 
>> functions (of course it is not a desirable breaking change to 
>> disallow that now, though).
>
> The idea is to encourage programmers to think about organizing 
> code so that there are clear separations between safe and 
> system code. Interleaving the two on a line-by-line basis 
> defeats the purpose.

This is a better argument against @trusted blocks within @safe 
blocks than it is against @system blocks within @trusted code.